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Finding the Fourth Proportional to 128,381.79, 192,591.14 and 39,642.15

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Solution

The fourth proportional to 128,381.79, 192,591.14 and 39,642.15 is: 59,468.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,381.79 : 192,591.14 = 39,642.15 : x
  2. Step 2: Convert to fraction form
    128,381.79/192,591.14 = 39,642.15/x
  3. Step 3: Cross multiply
    128,381.79x = 192,591.14 × 39,642.15
  4. Step 4: Simplify right side
    128,381.79x = 7,634,726,662.34
  5. Step 5: Solve for x
    x = 7,634,726,662.34/128,381.79
  6. Step 6: Final answer
    x = 59,468.92

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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.