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Finding the Fourth Proportional to 715,770.12, 987,781.68 and 389,105.10

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Solution

The fourth proportional to 715,770.12, 987,781.68 and 389,105.10 is: 536,975.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    715,770.12 : 987,781.68 = 389,105.10 : x
  2. Step 2: Convert to fraction form
    715,770.12/987,781.68 = 389,105.10/x
  3. Step 3: Cross multiply
    715,770.12x = 987,781.68 × 389,105.10
  4. Step 4: Simplify right side
    715,770.12x = 384,350,889,374.57
  5. Step 5: Solve for x
    x = 384,350,889,374.57/715,770.12
  6. Step 6: Final answer
    x = 536,975.32

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Double scale
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.