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Finding the Fourth Proportional to 83,620.80, 125,431.20 and 39,278.16

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Solution

The fourth proportional to 83,620.80, 125,431.20 and 39,278.16 is: 58,917.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    83,620.80 : 125,431.20 = 39,278.16 : x
  2. Step 2: Convert to fraction form
    83,620.80/125,431.20 = 39,278.16/x
  3. Step 3: Cross multiply
    83,620.80x = 125,431.20 × 39,278.16
  4. Step 4: Simplify right side
    83,620.80x = 4,926,706,742.59
  5. Step 5: Solve for x
    x = 4,926,706,742.59/83,620.80
  6. Step 6: Final answer
    x = 58,917.24

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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.