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Finding the Fourth Proportional to 86,911.10, 130,366.65 and 81,035.90

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Solution

The fourth proportional to 86,911.10, 130,366.65 and 81,035.90 is: 121,553.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,911.10 : 130,366.65 = 81,035.90 : x
  2. Step 2: Convert to fraction form
    86,911.10/130,366.65 = 81,035.90/x
  3. Step 3: Cross multiply
    86,911.10x = 130,366.65 × 81,035.90
  4. Step 4: Simplify right side
    86,911.10x = 10,564,378,812.74
  5. Step 5: Solve for x
    x = 10,564,378,812.74/86,911.10
  6. Step 6: Final answer
    x = 121,553.85

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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.