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Finding the Fourth Proportional to 642,540.68, 886,711.39 and 356,065.55

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Solution

The fourth proportional to 642,540.68, 886,711.39 and 356,065.55 is: 491,373.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    642,540.68 : 886,711.39 = 356,065.55 : x
  2. Step 2: Convert to fraction form
    642,540.68/886,711.39 = 356,065.55/x
  3. Step 3: Cross multiply
    642,540.68x = 886,711.39 × 356,065.55
  4. Step 4: Simplify right side
    642,540.68x = 315,727,378,771.62
  5. Step 5: Solve for x
    x = 315,727,378,771.62/642,540.68
  6. Step 6: Final answer
    x = 491,373.37

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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.