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Finding the Fourth Proportional to 61,630, 85,049.40 and 39,286.96

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Solution

The fourth proportional to 61,630, 85,049.40 and 39,286.96 is: 54,216.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    61,630 : 85,049.40 = 39,286.96 : x
  2. Step 2: Convert to fraction form
    61,630/85,049.40 = 39,286.96/x
  3. Step 3: Cross multiply
    61,630x = 85,049.40 × 39,286.96
  4. Step 4: Simplify right side
    61,630x = 3,341,332,375.82
  5. Step 5: Solve for x
    x = 3,341,332,375.82/61,630
  6. Step 6: Final answer
    x = 54,216.00

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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.