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Finding the Fourth Proportional to 86,577.40, 129,866.10 and 72,799.30

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Solution

The fourth proportional to 86,577.40, 129,866.10 and 72,799.30 is: 109,198.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,577.40 : 129,866.10 = 72,799.30 : x
  2. Step 2: Convert to fraction form
    86,577.40/129,866.10 = 72,799.30/x
  3. Step 3: Cross multiply
    86,577.40x = 129,866.10 × 72,799.30
  4. Step 4: Simplify right side
    86,577.40x = 9,454,161,173.73
  5. Step 5: Solve for x
    x = 9,454,161,173.73/86,577.40
  6. Step 6: Final answer
    x = 109,198.95

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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.