Home / 91,822.20-137,538.90-81,972.60

Finding the Fourth Proportional to 91,822.20, 137,538.90 and 81,972.60

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Solution

The fourth proportional to 91,822.20, 137,538.90 and 81,972.60 is: 122,785.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,822.20 : 137,538.90 = 81,972.60 : x
  2. Step 2: Convert to fraction form
    91,822.20/137,538.90 = 81,972.60/x
  3. Step 3: Cross multiply
    91,822.20x = 137,538.90 × 81,972.60
  4. Step 4: Simplify right side
    91,822.20x = 11,274,421,234.14
  5. Step 5: Solve for x
    x = 11,274,421,234.14/91,822.20
  6. Step 6: Final answer
    x = 122,785.35

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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.