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Finding the Fourth Proportional to 86,687.40, 129,836.70 and 86,687.40

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Solution

The fourth proportional to 86,687.40, 129,836.70 and 86,687.40 is: 129,836.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,687.40 : 129,836.70 = 86,687.40 : x
  2. Step 2: Convert to fraction form
    86,687.40/129,836.70 = 86,687.40/x
  3. Step 3: Cross multiply
    86,687.40x = 129,836.70 × 86,687.40
  4. Step 4: Simplify right side
    86,687.40x = 11,255,205,947.58
  5. Step 5: Solve for x
    x = 11,255,205,947.58/86,687.40
  6. Step 6: Final answer
    x = 129,836.70

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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.