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Finding the Fourth Proportional to 38,488.40, 57,751.80 and 21,861.20

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Solution

The fourth proportional to 38,488.40, 57,751.80 and 21,861.20 is: 32,802.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    38,488.40 : 57,751.80 = 21,861.20 : x
  2. Step 2: Convert to fraction form
    38,488.40/57,751.80 = 21,861.20/x
  3. Step 3: Cross multiply
    38,488.40x = 57,751.80 × 21,861.20
  4. Step 4: Simplify right side
    38,488.40x = 1,262,523,650.16
  5. Step 5: Solve for x
    x = 1,262,523,650.16/38,488.40
  6. Step 6: Final answer
    x = 32,802.71

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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.