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Finding the Fourth Proportional to 381.40, 572.10 and 107.47

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Solution

The fourth proportional to 381.40, 572.10 and 107.47 is: 161.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    381.40 : 572.10 = 107.47 : x
  2. Step 2: Convert to fraction form
    381.40/572.10 = 107.47/x
  3. Step 3: Cross multiply
    381.40x = 572.10 × 107.47
  4. Step 4: Simplify right side
    381.40x = 61,480.68
  5. Step 5: Solve for x
    x = 61,480.68/381.40
  6. Step 6: Final answer
    x = 161.20

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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.