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Finding the Fourth Proportional to 642,604.60, 963,906.90 and 406,408.60

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Solution

The fourth proportional to 642,604.60, 963,906.90 and 406,408.60 is: 609,612.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    642,604.60 : 963,906.90 = 406,408.60 : x
  2. Step 2: Convert to fraction form
    642,604.60/963,906.90 = 406,408.60/x
  3. Step 3: Cross multiply
    642,604.60x = 963,906.90 × 406,408.60
  4. Step 4: Simplify right side
    642,604.60x = 391,740,053,759.34
  5. Step 5: Solve for x
    x = 391,740,053,759.34/642,604.60
  6. Step 6: Final answer
    x = 609,612.90

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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.