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Finding the Fourth Proportional to 109,680.80, 164,521.20 and 81,687.20

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Solution

The fourth proportional to 109,680.80, 164,521.20 and 81,687.20 is: 122,530.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    109,680.80 : 164,521.20 = 81,687.20 : x
  2. Step 2: Convert to fraction form
    109,680.80/164,521.20 = 81,687.20/x
  3. Step 3: Cross multiply
    109,680.80x = 164,521.20 × 81,687.20
  4. Step 4: Simplify right side
    109,680.80x = 13,439,276,168.64
  5. Step 5: Solve for x
    x = 13,439,276,168.64/109,680.80
  6. Step 6: Final answer
    x = 122,530.80

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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.