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Finding the Fourth Proportional to 86,390.64, 129,487.14 and 36,395.82

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Solution

The fourth proportional to 86,390.64, 129,487.14 and 36,395.82 is: 54,552.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,390.64 : 129,487.14 = 36,395.82 : x
  2. Step 2: Convert to fraction form
    86,390.64/129,487.14 = 36,395.82/x
  3. Step 3: Cross multiply
    86,390.64x = 129,487.14 × 36,395.82
  4. Step 4: Simplify right side
    86,390.64x = 4,712,790,639.75
  5. Step 5: Solve for x
    x = 4,712,790,639.75/86,390.64
  6. Step 6: Final answer
    x = 54,552.10

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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.