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Finding the Fourth Proportional to 642.76, 886.92 and 377.12

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Solution

The fourth proportional to 642.76, 886.92 and 377.12 is: 520.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    642.76 : 886.92 = 377.12 : x
  2. Step 2: Convert to fraction form
    642.76/886.92 = 377.12/x
  3. Step 3: Cross multiply
    642.76x = 886.92 × 377.12
  4. Step 4: Simplify right side
    642.76x = 334,475.27
  5. Step 5: Solve for x
    x = 334,475.27/642.76
  6. Step 6: Final answer
    x = 520.37

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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.