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Finding the Fourth Proportional to 90,314.32, 135,422.10 and 71,713.84

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Solution

The fourth proportional to 90,314.32, 135,422.10 and 71,713.84 is: 107,531.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,314.32 : 135,422.10 = 71,713.84 : x
  2. Step 2: Convert to fraction form
    90,314.32/135,422.10 = 71,713.84/x
  3. Step 3: Cross multiply
    90,314.32x = 135,422.10 × 71,713.84
  4. Step 4: Simplify right side
    90,314.32x = 9,711,638,811.86
  5. Step 5: Solve for x
    x = 9,711,638,811.86/90,314.32
  6. Step 6: Final answer
    x = 107,531.55

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.