Home / 81,005.76-111,811.68-51,215.04

Finding the Fourth Proportional to 81,005.76, 111,811.68 and 51,215.04

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Solution

The fourth proportional to 81,005.76, 111,811.68 and 51,215.04 is: 70,691.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,005.76 : 111,811.68 = 51,215.04 : x
  2. Step 2: Convert to fraction form
    81,005.76/111,811.68 = 51,215.04/x
  3. Step 3: Cross multiply
    81,005.76x = 111,811.68 × 51,215.04
  4. Step 4: Simplify right side
    81,005.76x = 5,726,439,663.67
  5. Step 5: Solve for x
    x = 5,726,439,663.67/81,005.76
  6. Step 6: Final answer
    x = 70,691.76

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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.