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Finding the Fourth Proportional to 122,116.80, 183,175.20 and 86,687.40

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Solution

The fourth proportional to 122,116.80, 183,175.20 and 86,687.40 is: 130,031.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    122,116.80 : 183,175.20 = 86,687.40 : x
  2. Step 2: Convert to fraction form
    122,116.80/183,175.20 = 86,687.40/x
  3. Step 3: Cross multiply
    122,116.80x = 183,175.20 × 86,687.40
  4. Step 4: Simplify right side
    122,116.80x = 15,878,981,832.48
  5. Step 5: Solve for x
    x = 15,878,981,832.48/122,116.80
  6. Step 6: Final answer
    x = 130,031.10

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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.