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Finding the Fourth Proportional to 86,700.80, 129,856.80 and 75,036.80

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Solution

The fourth proportional to 86,700.80, 129,856.80 and 75,036.80 is: 112,386.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,700.80 : 129,856.80 = 75,036.80 : x
  2. Step 2: Convert to fraction form
    86,700.80/129,856.80 = 75,036.80/x
  3. Step 3: Cross multiply
    86,700.80x = 129,856.80 × 75,036.80
  4. Step 4: Simplify right side
    86,700.80x = 9,744,038,730.24
  5. Step 5: Solve for x
    x = 9,744,038,730.24/86,700.80
  6. Step 6: Final answer
    x = 112,386.95

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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.