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Finding the Fourth Proportional to 611,456.40, 917,184.60 and 412,390.80

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Solution

The fourth proportional to 611,456.40, 917,184.60 and 412,390.80 is: 618,586.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    611,456.40 : 917,184.60 = 412,390.80 : x
  2. Step 2: Convert to fraction form
    611,456.40/917,184.60 = 412,390.80/x
  3. Step 3: Cross multiply
    611,456.40x = 917,184.60 × 412,390.80
  4. Step 4: Simplify right side
    611,456.40x = 378,238,490,941.68
  5. Step 5: Solve for x
    x = 378,238,490,941.68/611,456.40
  6. Step 6: Final answer
    x = 618,586.20

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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.