Home / 81,428.70-122,114.25-38,729.10

Finding the Fourth Proportional to 81,428.70, 122,114.25 and 38,729.10

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Solution

The fourth proportional to 81,428.70, 122,114.25 and 38,729.10 is: 58,079.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,428.70 : 122,114.25 = 38,729.10 : x
  2. Step 2: Convert to fraction form
    81,428.70/122,114.25 = 38,729.10/x
  3. Step 3: Cross multiply
    81,428.70x = 122,114.25 × 38,729.10
  4. Step 4: Simplify right side
    81,428.70x = 4,729,374,999.68
  5. Step 5: Solve for x
    x = 4,729,374,999.68/81,428.70
  6. Step 6: Final answer
    x = 58,079.95

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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.