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Finding the Fourth Proportional to 91,019.66, 125,321.29 and 77,380.88

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Solution

The fourth proportional to 91,019.66, 125,321.29 and 77,380.88 is: 106,542.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,019.66 : 125,321.29 = 77,380.88 : x
  2. Step 2: Convert to fraction form
    91,019.66/125,321.29 = 77,380.88/x
  3. Step 3: Cross multiply
    91,019.66x = 125,321.29 × 77,380.88
  4. Step 4: Simplify right side
    91,019.66x = 9,697,471,702.94
  5. Step 5: Solve for x
    x = 9,697,471,702.94/91,019.66
  6. Step 6: Final answer
    x = 106,542.61

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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.