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Finding the Fourth Proportional to 81,687.58, 112,728.88 and 45,877.64

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Solution

The fourth proportional to 81,687.58, 112,728.88 and 45,877.64 is: 63,311.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,687.58 : 112,728.88 = 45,877.64 : x
  2. Step 2: Convert to fraction form
    81,687.58/112,728.88 = 45,877.64/x
  3. Step 3: Cross multiply
    81,687.58x = 112,728.88 × 45,877.64
  4. Step 4: Simplify right side
    81,687.58x = 5,171,734,974.24
  5. Step 5: Solve for x
    x = 5,171,734,974.24/81,687.58
  6. Step 6: Final answer
    x = 63,311.15

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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.