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Finding the Fourth Proportional to 638.86, 963.60 and 562.78

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Solution

The fourth proportional to 638.86, 963.60 and 562.78 is: 848.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    638.86 : 963.60 = 562.78 : x
  2. Step 2: Convert to fraction form
    638.86/963.60 = 562.78/x
  3. Step 3: Cross multiply
    638.86x = 963.60 × 562.78
  4. Step 4: Simplify right side
    638.86x = 542,287.18
  5. Step 5: Solve for x
    x = 542,287.18/638.86
  6. Step 6: Final answer
    x = 848.84

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.