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Finding the Fourth Proportional to 81,279.12, 112,171.12 and 45,480.64

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Solution

The fourth proportional to 81,279.12, 112,171.12 and 45,480.64 is: 62,766.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,279.12 : 112,171.12 = 45,480.64 : x
  2. Step 2: Convert to fraction form
    81,279.12/112,171.12 = 45,480.64/x
  3. Step 3: Cross multiply
    81,279.12x = 112,171.12 × 45,480.64
  4. Step 4: Simplify right side
    81,279.12x = 5,101,614,327.12
  5. Step 5: Solve for x
    x = 5,101,614,327.12/81,279.12
  6. Step 6: Final answer
    x = 62,766.60

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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.