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Finding the Fourth Proportional to 65,375.48, 90,217.32 and 38,519.12

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Solution

The fourth proportional to 65,375.48, 90,217.32 and 38,519.12 is: 53,155.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    65,375.48 : 90,217.32 = 38,519.12 : x
  2. Step 2: Convert to fraction form
    65,375.48/90,217.32 = 38,519.12/x
  3. Step 3: Cross multiply
    65,375.48x = 90,217.32 × 38,519.12
  4. Step 4: Simplify right side
    65,375.48x = 3,475,091,775.16
  5. Step 5: Solve for x
    x = 3,475,091,775.16/65,375.48
  6. Step 6: Final answer
    x = 53,155.89

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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.