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Finding the Fourth Proportional to 642.24, 886.14 and 380.34

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Solution

The fourth proportional to 642.24, 886.14 and 380.34 is: 524.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    642.24 : 886.14 = 380.34 : x
  2. Step 2: Convert to fraction form
    642.24/886.14 = 380.34/x
  3. Step 3: Cross multiply
    642.24x = 886.14 × 380.34
  4. Step 4: Simplify right side
    642.24x = 337,034.49
  5. Step 5: Solve for x
    x = 337,034.49/642.24
  6. Step 6: Final answer
    x = 524.78

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.