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Finding the Fourth Proportional to 128,052.90, 192,079.35 and 81,512.10

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Solution

The fourth proportional to 128,052.90, 192,079.35 and 81,512.10 is: 122,268.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,052.90 : 192,079.35 = 81,512.10 : x
  2. Step 2: Convert to fraction form
    128,052.90/192,079.35 = 81,512.10/x
  3. Step 3: Cross multiply
    128,052.90x = 192,079.35 × 81,512.10
  4. Step 4: Simplify right side
    128,052.90x = 15,656,791,185.14
  5. Step 5: Solve for x
    x = 15,656,791,185.14/128,052.90
  6. Step 6: Final answer
    x = 122,268.15

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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.