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Finding the Fourth Proportional to 620,642.60, 930,963.90 and 408,066.20

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Solution

The fourth proportional to 620,642.60, 930,963.90 and 408,066.20 is: 612,099.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    620,642.60 : 930,963.90 = 408,066.20 : x
  2. Step 2: Convert to fraction form
    620,642.60/930,963.90 = 408,066.20/x
  3. Step 3: Cross multiply
    620,642.60x = 930,963.90 × 408,066.20
  4. Step 4: Simplify right side
    620,642.60x = 379,894,901,010.18
  5. Step 5: Solve for x
    x = 379,894,901,010.18/620,642.60
  6. Step 6: Final answer
    x = 612,099.30

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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.