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Finding the Fourth Proportional to 90,702.87, 125,126.42 and 78,105.75

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Solution

The fourth proportional to 90,702.87, 125,126.42 and 78,105.75 is: 107,748.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,702.87 : 125,126.42 = 78,105.75 : x
  2. Step 2: Convert to fraction form
    90,702.87/125,126.42 = 78,105.75/x
  3. Step 3: Cross multiply
    90,702.87x = 125,126.42 × 78,105.75
  4. Step 4: Simplify right side
    90,702.87x = 9,773,092,488.39
  5. Step 5: Solve for x
    x = 9,773,092,488.39/90,702.87
  6. Step 6: Final answer
    x = 107,748.44

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1.5x scale

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.