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Finding the Fourth Proportional to 86,411.52, 129,487.68 and 66,660.48

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Solution

The fourth proportional to 86,411.52, 129,487.68 and 66,660.48 is: 99,890.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,411.52 : 129,487.68 = 66,660.48 : x
  2. Step 2: Convert to fraction form
    86,411.52/129,487.68 = 66,660.48/x
  3. Step 3: Cross multiply
    86,411.52x = 129,487.68 × 66,660.48
  4. Step 4: Simplify right side
    86,411.52x = 8,631,710,902.89
  5. Step 5: Solve for x
    x = 8,631,710,902.89/86,411.52
  6. Step 6: Final answer
    x = 99,890.74

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1.5x scale

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.