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Finding the Fourth Proportional to 91,080, 125,691.36 and 51,336

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Solution

The fourth proportional to 91,080, 125,691.36 and 51,336 is: 70,844.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,080 : 125,691.36 = 51,336 : x
  2. Step 2: Convert to fraction form
    91,080/125,691.36 = 51,336/x
  3. Step 3: Cross multiply
    91,080x = 125,691.36 × 51,336
  4. Step 4: Simplify right side
    91,080x = 6,452,491,656.96
  5. Step 5: Solve for x
    x = 6,452,491,656.96/91,080
  6. Step 6: Final answer
    x = 70,844.22

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.