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Finding the Fourth Proportional to 86,521.80, 129,710.70 and 36,640.20

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Solution

The fourth proportional to 86,521.80, 129,710.70 and 36,640.20 is: 54,929.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,521.80 : 129,710.70 = 36,640.20 : x
  2. Step 2: Convert to fraction form
    86,521.80/129,710.70 = 36,640.20/x
  3. Step 3: Cross multiply
    86,521.80x = 129,710.70 × 36,640.20
  4. Step 4: Simplify right side
    86,521.80x = 4,752,625,990.14
  5. Step 5: Solve for x
    x = 4,752,625,990.14/86,521.80
  6. Step 6: Final answer
    x = 54,929.81

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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.