Home / 81,141.72-121,534.56-66,942

Finding the Fourth Proportional to 81,141.72, 121,534.56 and 66,942

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Solution

The fourth proportional to 81,141.72, 121,534.56 and 66,942 is: 100,266.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,141.72 : 121,534.56 = 66,942 : x
  2. Step 2: Convert to fraction form
    81,141.72/121,534.56 = 66,942/x
  3. Step 3: Cross multiply
    81,141.72x = 121,534.56 × 66,942
  4. Step 4: Simplify right side
    81,141.72x = 8,135,766,515.52
  5. Step 5: Solve for x
    x = 8,135,766,515.52/81,141.72
  6. Step 6: Final answer
    x = 100,266.13

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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.