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Finding the Fourth Proportional to 58,585.54, 87,869.13 and 21,139.78

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Solution

The fourth proportional to 58,585.54, 87,869.13 and 21,139.78 is: 31,706.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    58,585.54 : 87,869.13 = 21,139.78 : x
  2. Step 2: Convert to fraction form
    58,585.54/87,869.13 = 21,139.78/x
  3. Step 3: Cross multiply
    58,585.54x = 87,869.13 × 21,139.78
  4. Step 4: Simplify right side
    58,585.54x = 1,857,534,076.99
  5. Step 5: Solve for x
    x = 1,857,534,076.99/58,585.54
  6. Step 6: Final answer
    x = 31,706.36

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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.