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Finding the Fourth Proportional to 658,072.80, 987,109.20 and 490,111.20

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Solution

The fourth proportional to 658,072.80, 987,109.20 and 490,111.20 is: 735,166.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    658,072.80 : 987,109.20 = 490,111.20 : x
  2. Step 2: Convert to fraction form
    658,072.80/987,109.20 = 490,111.20/x
  3. Step 3: Cross multiply
    658,072.80x = 987,109.20 × 490,111.20
  4. Step 4: Simplify right side
    658,072.80x = 483,793,274,543.04
  5. Step 5: Solve for x
    x = 483,793,274,543.04/658,072.80
  6. Step 6: Final answer
    x = 735,166.80

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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.