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Finding the Fourth Proportional to 380.39, 570.42 and 149.24

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Solution

The fourth proportional to 380.39, 570.42 and 149.24 is: 223.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    380.39 : 570.42 = 149.24 : x
  2. Step 2: Convert to fraction form
    380.39/570.42 = 149.24/x
  3. Step 3: Cross multiply
    380.39x = 570.42 × 149.24
  4. Step 4: Simplify right side
    380.39x = 85,130.91
  5. Step 5: Solve for x
    x = 85,130.91/380.39
  6. Step 6: Final answer
    x = 223.80

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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.