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Finding the Fourth Proportional to 90,702.72, 125,230.80 and 81,112.80

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Solution

The fourth proportional to 90,702.72, 125,230.80 and 81,112.80 is: 111,990.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,702.72 : 125,230.80 = 81,112.80 : x
  2. Step 2: Convert to fraction form
    90,702.72/125,230.80 = 81,112.80/x
  3. Step 3: Cross multiply
    90,702.72x = 125,230.80 × 81,112.80
  4. Step 4: Simplify right side
    90,702.72x = 10,157,820,834.24
  5. Step 5: Solve for x
    x = 10,157,820,834.24/90,702.72
  6. Step 6: Final answer
    x = 111,990.26

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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.