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Finding the Fourth Proportional to 128,658.88, 177,560.32 and 72,081.92

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Solution

The fourth proportional to 128,658.88, 177,560.32 and 72,081.92 is: 99,479.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,658.88 : 177,560.32 = 72,081.92 : x
  2. Step 2: Convert to fraction form
    128,658.88/177,560.32 = 72,081.92/x
  3. Step 3: Cross multiply
    128,658.88x = 177,560.32 × 72,081.92
  4. Step 4: Simplify right side
    128,658.88x = 12,798,888,781.41
  5. Step 5: Solve for x
    x = 12,798,888,781.41/128,658.88
  6. Step 6: Final answer
    x = 99,479.25

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.