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Finding the Fourth Proportional to 81,687.70, 112,723.47 and 45,881.04

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Solution

The fourth proportional to 81,687.70, 112,723.47 and 45,881.04 is: 63,312.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,687.70 : 112,723.47 = 45,881.04 : x
  2. Step 2: Convert to fraction form
    81,687.70/112,723.47 = 45,881.04/x
  3. Step 3: Cross multiply
    81,687.70x = 112,723.47 × 45,881.04
  4. Step 4: Simplify right side
    81,687.70x = 5,171,870,036.01
  5. Step 5: Solve for x
    x = 5,171,870,036.01/81,687.70
  6. Step 6: Final answer
    x = 63,312.72

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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.