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Finding the Fourth Proportional to 91,873.70, 137,810.55 and 81,851.30

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Solution

The fourth proportional to 91,873.70, 137,810.55 and 81,851.30 is: 122,776.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,873.70 : 137,810.55 = 81,851.30 : x
  2. Step 2: Convert to fraction form
    91,873.70/137,810.55 = 81,851.30/x
  3. Step 3: Cross multiply
    91,873.70x = 137,810.55 × 81,851.30
  4. Step 4: Simplify right side
    91,873.70x = 11,279,972,671.22
  5. Step 5: Solve for x
    x = 11,279,972,671.22/91,873.70
  6. Step 6: Final answer
    x = 122,776.95

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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.