Home / 81,572.27-122,136.96-81,129.40

Finding the Fourth Proportional to 81,572.27, 122,136.96 and 81,129.40

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Solution

The fourth proportional to 81,572.27, 122,136.96 and 81,129.40 is: 121,473.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,572.27 : 122,136.96 = 81,129.40 : x
  2. Step 2: Convert to fraction form
    81,572.27/122,136.96 = 81,129.40/x
  3. Step 3: Cross multiply
    81,572.27x = 122,136.96 × 81,129.40
  4. Step 4: Simplify right side
    81,572.27x = 9,908,898,281.52
  5. Step 5: Solve for x
    x = 9,908,898,281.52/81,572.27
  6. Step 6: Final answer
    x = 121,473.86

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.