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Finding the Fourth Proportional to 257,720.28, 386,606.96 and 89,240.28

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Solution

The fourth proportional to 257,720.28, 386,606.96 and 89,240.28 is: 133,869.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    257,720.28 : 386,606.96 = 89,240.28 : x
  2. Step 2: Convert to fraction form
    257,720.28/386,606.96 = 89,240.28/x
  3. Step 3: Cross multiply
    257,720.28x = 386,606.96 × 89,240.28
  4. Step 4: Simplify right side
    257,720.28x = 34,500,912,914.15
  5. Step 5: Solve for x
    x = 34,500,912,914.15/257,720.28
  6. Step 6: Final answer
    x = 133,869.61

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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.