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Finding the Fourth Proportional to 86,457.60, 129,427.20 and 81,331.20

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Solution

The fourth proportional to 86,457.60, 129,427.20 and 81,331.20 is: 121,752.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,457.60 : 129,427.20 = 81,331.20 : x
  2. Step 2: Convert to fraction form
    86,457.60/129,427.20 = 81,331.20/x
  3. Step 3: Cross multiply
    86,457.60x = 129,427.20 × 81,331.20
  4. Step 4: Simplify right side
    86,457.60x = 10,526,469,488.64
  5. Step 5: Solve for x
    x = 10,526,469,488.64/86,457.60
  6. Step 6: Final answer
    x = 121,752.97

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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.