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Finding the Fourth Proportional to 128,001.30, 192,001.95 and 81,306.90

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Solution

The fourth proportional to 128,001.30, 192,001.95 and 81,306.90 is: 121,960.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,001.30 : 192,001.95 = 81,306.90 : x
  2. Step 2: Convert to fraction form
    128,001.30/192,001.95 = 81,306.90/x
  3. Step 3: Cross multiply
    128,001.30x = 192,001.95 × 81,306.90
  4. Step 4: Simplify right side
    128,001.30x = 15,611,083,348.46
  5. Step 5: Solve for x
    x = 15,611,083,348.46/128,001.30
  6. Step 6: Final answer
    x = 121,960.35

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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.