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Finding the Fourth Proportional to 380.52, 570.40 and 149.20

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Solution

The fourth proportional to 380.52, 570.40 and 149.20 is: 223.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    380.52 : 570.40 = 149.20 : x
  2. Step 2: Convert to fraction form
    380.52/570.40 = 149.20/x
  3. Step 3: Cross multiply
    380.52x = 570.40 × 149.20
  4. Step 4: Simplify right side
    380.52x = 85,103.68
  5. Step 5: Solve for x
    x = 85,103.68/380.52
  6. Step 6: Final answer
    x = 223.65

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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.