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Finding the Fourth Proportional to 90,978.46, 125,548.61 and 50,691.36

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Solution

The fourth proportional to 90,978.46, 125,548.61 and 50,691.36 is: 69,953.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,978.46 : 125,548.61 = 50,691.36 : x
  2. Step 2: Convert to fraction form
    90,978.46/125,548.61 = 50,691.36/x
  3. Step 3: Cross multiply
    90,978.46x = 125,548.61 × 50,691.36
  4. Step 4: Simplify right side
    90,978.46x = 6,364,229,298.15
  5. Step 5: Solve for x
    x = 6,364,229,298.15/90,978.46
  6. Step 6: Final answer
    x = 69,953.14

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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.