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Finding the Fourth Proportional to 221,397.27, 331,935.81 and 86,346.87

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Solution

The fourth proportional to 221,397.27, 331,935.81 and 86,346.87 is: 129,457.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    221,397.27 : 331,935.81 = 86,346.87 : x
  2. Step 2: Convert to fraction form
    221,397.27/331,935.81 = 86,346.87/x
  3. Step 3: Cross multiply
    221,397.27x = 331,935.81 × 86,346.87
  4. Step 4: Simplify right side
    221,397.27x = 28,661,618,234.41
  5. Step 5: Solve for x
    x = 28,661,618,234.41/221,397.27
  6. Step 6: Final answer
    x = 129,457.87

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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.