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Finding the Fourth Proportional to 128,780.60, 192,387.48 and 83,432.80

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Solution

The fourth proportional to 128,780.60, 192,387.48 and 83,432.80 is: 124,641.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,780.60 : 192,387.48 = 83,432.80 : x
  2. Step 2: Convert to fraction form
    128,780.60/192,387.48 = 83,432.80/x
  3. Step 3: Cross multiply
    128,780.60x = 192,387.48 × 83,432.80
  4. Step 4: Simplify right side
    128,780.60x = 16,051,426,141.34
  5. Step 5: Solve for x
    x = 16,051,426,141.34/128,780.60
  6. Step 6: Final answer
    x = 124,641.65

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.