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Finding the Fourth Proportional to 38,488.40, 57,721.80 and 12,201.20

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Solution

The fourth proportional to 38,488.40, 57,721.80 and 12,201.20 is: 18,298.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    38,488.40 : 57,721.80 = 12,201.20 : x
  2. Step 2: Convert to fraction form
    38,488.40/57,721.80 = 12,201.20/x
  3. Step 3: Cross multiply
    38,488.40x = 57,721.80 × 12,201.20
  4. Step 4: Simplify right side
    38,488.40x = 704,275,226.16
  5. Step 5: Solve for x
    x = 704,275,226.16/38,488.40
  6. Step 6: Final answer
    x = 18,298.38

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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.