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Finding the Fourth Proportional to 128,432.10, 192,648.15 and 81,192.90

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Solution

The fourth proportional to 128,432.10, 192,648.15 and 81,192.90 is: 121,789.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,432.10 : 192,648.15 = 81,192.90 : x
  2. Step 2: Convert to fraction form
    128,432.10/192,648.15 = 81,192.90/x
  3. Step 3: Cross multiply
    128,432.10x = 192,648.15 × 81,192.90
  4. Step 4: Simplify right side
    128,432.10x = 15,641,661,978.14
  5. Step 5: Solve for x
    x = 15,641,661,978.14/128,432.10
  6. Step 6: Final answer
    x = 121,789.35

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1.5x scale

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.