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Finding the Fourth Proportional to 90,321.64, 135,486.76 and 43,613.80

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Solution

The fourth proportional to 90,321.64, 135,486.76 and 43,613.80 is: 65,422.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,321.64 : 135,486.76 = 43,613.80 : x
  2. Step 2: Convert to fraction form
    90,321.64/135,486.76 = 43,613.80/x
  3. Step 3: Cross multiply
    90,321.64x = 135,486.76 × 43,613.80
  4. Step 4: Simplify right side
    90,321.64x = 5,909,092,453.29
  5. Step 5: Solve for x
    x = 5,909,092,453.29/90,321.64
  6. Step 6: Final answer
    x = 65,422.78

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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.