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Finding the Fourth Proportional to 86,644.74, 129,671.40 and 72,620.61

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Solution

The fourth proportional to 86,644.74, 129,671.40 and 72,620.61 is: 108,683.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,644.74 : 129,671.40 = 72,620.61 : x
  2. Step 2: Convert to fraction form
    86,644.74/129,671.40 = 72,620.61/x
  3. Step 3: Cross multiply
    86,644.74x = 129,671.40 × 72,620.61
  4. Step 4: Simplify right side
    86,644.74x = 9,416,816,167.55
  5. Step 5: Solve for x
    x = 9,416,816,167.55/86,644.74
  6. Step 6: Final answer
    x = 108,683.07

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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.