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Finding the Fourth Proportional to 90,978.14, 125,546.25 and 50,690.86

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Solution

The fourth proportional to 90,978.14, 125,546.25 and 50,690.86 is: 69,951.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,978.14 : 125,546.25 = 50,690.86 : x
  2. Step 2: Convert to fraction form
    90,978.14/125,546.25 = 50,690.86/x
  3. Step 3: Cross multiply
    90,978.14x = 125,546.25 × 50,690.86
  4. Step 4: Simplify right side
    90,978.14x = 6,364,047,964.70
  5. Step 5: Solve for x
    x = 6,364,047,964.70/90,978.14
  6. Step 6: Final answer
    x = 69,951.40

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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.