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Finding the Fourth Proportional to 658,136.80, 987,205.20 and 378,200.80

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Solution

The fourth proportional to 658,136.80, 987,205.20 and 378,200.80 is: 567,301.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    658,136.80 : 987,205.20 = 378,200.80 : x
  2. Step 2: Convert to fraction form
    658,136.80/987,205.20 = 378,200.80/x
  3. Step 3: Cross multiply
    658,136.80x = 987,205.20 × 378,200.80
  4. Step 4: Simplify right side
    658,136.80x = 373,361,796,404.16
  5. Step 5: Solve for x
    x = 373,361,796,404.16/658,136.80
  6. Step 6: Final answer
    x = 567,301.20

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Half scale
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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.