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Finding the Fourth Proportional to 99,689.47, 149,596.45 and 66,432.87

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Solution

The fourth proportional to 99,689.47, 149,596.45 and 66,432.87 is: 99,690.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    99,689.47 : 149,596.45 = 66,432.87 : x
  2. Step 2: Convert to fraction form
    99,689.47/149,596.45 = 66,432.87/x
  3. Step 3: Cross multiply
    99,689.47x = 149,596.45 × 66,432.87
  4. Step 4: Simplify right side
    99,689.47x = 9,938,121,515.31
  5. Step 5: Solve for x
    x = 9,938,121,515.31/99,689.47
  6. Step 6: Final answer
    x = 99,690.78

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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.