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Finding the Fourth Proportional to 81,758.70, 112,508.19 and 72,349.74

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Solution

The fourth proportional to 81,758.70, 112,508.19 and 72,349.74 is: 99,560.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,758.70 : 112,508.19 = 72,349.74 : x
  2. Step 2: Convert to fraction form
    81,758.70/112,508.19 = 72,349.74/x
  3. Step 3: Cross multiply
    81,758.70x = 112,508.19 × 72,349.74
  4. Step 4: Simplify right side
    81,758.70x = 8,139,938,294.37
  5. Step 5: Solve for x
    x = 8,139,938,294.37/81,758.70
  6. Step 6: Final answer
    x = 99,560.52

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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.