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Finding the Fourth Proportional to 81,612.70, 112,672.40 and 54,381.60

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Solution

The fourth proportional to 81,612.70, 112,672.40 and 54,381.60 is: 75,077.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,612.70 : 112,672.40 = 54,381.60 : x
  2. Step 2: Convert to fraction form
    81,612.70/112,672.40 = 54,381.60/x
  3. Step 3: Cross multiply
    81,612.70x = 112,672.40 × 54,381.60
  4. Step 4: Simplify right side
    81,612.70x = 6,127,305,115.93
  5. Step 5: Solve for x
    x = 6,127,305,115.93/81,612.70
  6. Step 6: Final answer
    x = 75,077.84

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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.