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Finding the Fourth Proportional to 83,679.60, 125,519.40 and 72,015.60

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Solution

The fourth proportional to 83,679.60, 125,519.40 and 72,015.60 is: 108,023.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    83,679.60 : 125,519.40 = 72,015.60 : x
  2. Step 2: Convert to fraction form
    83,679.60/125,519.40 = 72,015.60/x
  3. Step 3: Cross multiply
    83,679.60x = 125,519.40 × 72,015.60
  4. Step 4: Simplify right side
    83,679.60x = 9,039,354,902.64
  5. Step 5: Solve for x
    x = 9,039,354,902.64/83,679.60
  6. Step 6: Final answer
    x = 108,023.40

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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.