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Finding the Fourth Proportional to 86,645.76, 129,787.52 and 69,687.10

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Solution

The fourth proportional to 86,645.76, 129,787.52 and 69,687.10 is: 104,384.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,645.76 : 129,787.52 = 69,687.10 : x
  2. Step 2: Convert to fraction form
    86,645.76/129,787.52 = 69,687.10/x
  3. Step 3: Cross multiply
    86,645.76x = 129,787.52 × 69,687.10
  4. Step 4: Simplify right side
    86,645.76x = 9,044,515,884.99
  5. Step 5: Solve for x
    x = 9,044,515,884.99/86,645.76
  6. Step 6: Final answer
    x = 104,384.98

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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.