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Finding the Fourth Proportional to 90,391.68, 135,456.48 and 64,147.68

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Solution

The fourth proportional to 90,391.68, 135,456.48 and 64,147.68 is: 96,128.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,391.68 : 135,456.48 = 64,147.68 : x
  2. Step 2: Convert to fraction form
    90,391.68/135,456.48 = 64,147.68/x
  3. Step 3: Cross multiply
    90,391.68x = 135,456.48 × 64,147.68
  4. Step 4: Simplify right side
    90,391.68x = 8,689,218,932.97
  5. Step 5: Solve for x
    x = 8,689,218,932.97/90,391.68
  6. Step 6: Final answer
    x = 96,128.53

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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.