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Finding the Fourth Proportional to 638.34, 956.55 and 291.48

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Solution

The fourth proportional to 638.34, 956.55 and 291.48 is: 436.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    638.34 : 956.55 = 291.48 : x
  2. Step 2: Convert to fraction form
    638.34/956.55 = 291.48/x
  3. Step 3: Cross multiply
    638.34x = 956.55 × 291.48
  4. Step 4: Simplify right side
    638.34x = 278,815.19
  5. Step 5: Solve for x
    x = 278,815.19/638.34
  6. Step 6: Final answer
    x = 436.78

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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.