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Finding the Fourth Proportional to 90,978.12, 125,548.11 and 50,691.02

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Solution

The fourth proportional to 90,978.12, 125,548.11 and 50,691.02 is: 69,952.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,978.12 : 125,548.11 = 50,691.02 : x
  2. Step 2: Convert to fraction form
    90,978.12/125,548.11 = 50,691.02/x
  3. Step 3: Cross multiply
    90,978.12x = 125,548.11 × 50,691.02
  4. Step 4: Simplify right side
    90,978.12x = 6,364,161,341.08
  5. Step 5: Solve for x
    x = 6,364,161,341.08/90,978.12
  6. Step 6: Final answer
    x = 69,952.66

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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.