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Finding the Fourth Proportional to 86,679.20, 129,730.80 and 62,919.20

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Solution

The fourth proportional to 86,679.20, 129,730.80 and 62,919.20 is: 94,169.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,679.20 : 129,730.80 = 62,919.20 : x
  2. Step 2: Convert to fraction form
    86,679.20/129,730.80 = 62,919.20/x
  3. Step 3: Cross multiply
    86,679.20x = 129,730.80 × 62,919.20
  4. Step 4: Simplify right side
    86,679.20x = 8,162,558,151.36
  5. Step 5: Solve for x
    x = 8,162,558,151.36/86,679.20
  6. Step 6: Final answer
    x = 94,169.74

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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.