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Finding the Fourth Proportional to 81,279, 112,161.90 and 45,472.32

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Solution

The fourth proportional to 81,279, 112,161.90 and 45,472.32 is: 62,750.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,279 : 112,161.90 = 45,472.32 : x
  2. Step 2: Convert to fraction form
    81,279/112,161.90 = 45,472.32/x
  3. Step 3: Cross multiply
    81,279x = 112,161.90 × 45,472.32
  4. Step 4: Simplify right side
    81,279x = 5,100,261,808.61
  5. Step 5: Solve for x
    x = 5,100,261,808.61/81,279
  6. Step 6: Final answer
    x = 62,750.06

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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.