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Finding the Fourth Proportional to 81,138.72, 111,965.04 and 45,325.92

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Solution

The fourth proportional to 81,138.72, 111,965.04 and 45,325.92 is: 62,546.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,138.72 : 111,965.04 = 45,325.92 : x
  2. Step 2: Convert to fraction form
    81,138.72/111,965.04 = 45,325.92/x
  3. Step 3: Cross multiply
    81,138.72x = 111,965.04 × 45,325.92
  4. Step 4: Simplify right side
    81,138.72x = 5,074,918,445.84
  5. Step 5: Solve for x
    x = 5,074,918,445.84/81,138.72
  6. Step 6: Final answer
    x = 62,546.20

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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.