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Finding the Fourth Proportional to 638.24, 886.71 and 630.56

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Solution

The fourth proportional to 638.24, 886.71 and 630.56 is: 876.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    638.24 : 886.71 = 630.56 : x
  2. Step 2: Convert to fraction form
    638.24/886.71 = 630.56/x
  3. Step 3: Cross multiply
    638.24x = 886.71 × 630.56
  4. Step 4: Simplify right side
    638.24x = 559,123.86
  5. Step 5: Solve for x
    x = 559,123.86/638.24
  6. Step 6: Final answer
    x = 876.04

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.