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Finding the Fourth Proportional to 90,381.71, 124,712.10 and 56,384.79

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Solution

The fourth proportional to 90,381.71, 124,712.10 and 56,384.79 is: 77,801.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,381.71 : 124,712.10 = 56,384.79 : x
  2. Step 2: Convert to fraction form
    90,381.71/124,712.10 = 56,384.79/x
  3. Step 3: Cross multiply
    90,381.71x = 124,712.10 × 56,384.79
  4. Step 4: Simplify right side
    90,381.71x = 7,031,865,568.96
  5. Step 5: Solve for x
    x = 7,031,865,568.96/90,381.71
  6. Step 6: Final answer
    x = 77,801.87

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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.