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Finding the Fourth Proportional to 86,498.80, 129,845.40 and 66,864.40

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Solution

The fourth proportional to 86,498.80, 129,845.40 and 66,864.40 is: 100,371.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,498.80 : 129,845.40 = 66,864.40 : x
  2. Step 2: Convert to fraction form
    86,498.80/129,845.40 = 66,864.40/x
  3. Step 3: Cross multiply
    86,498.80x = 129,845.40 × 66,864.40
  4. Step 4: Simplify right side
    86,498.80x = 8,682,034,763.76
  5. Step 5: Solve for x
    x = 8,682,034,763.76/86,498.80
  6. Step 6: Final answer
    x = 100,371.74

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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.