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Finding the Fourth Proportional to 65,489.85, 90,387.81 and 38,630.76

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Solution

The fourth proportional to 65,489.85, 90,387.81 and 38,630.76 is: 53,317.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    65,489.85 : 90,387.81 = 38,630.76 : x
  2. Step 2: Convert to fraction form
    65,489.85/90,387.81 = 38,630.76/x
  3. Step 3: Cross multiply
    65,489.85x = 90,387.81 × 38,630.76
  4. Step 4: Simplify right side
    65,489.85x = 3,491,749,795.04
  5. Step 5: Solve for x
    x = 3,491,749,795.04/65,489.85
  6. Step 6: Final answer
    x = 53,317.42

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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.