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Finding the Fourth Proportional to 638.30, 956.11 and 291.93

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Solution

The fourth proportional to 638.30, 956.11 and 291.93 is: 437.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    638.30 : 956.11 = 291.93 : x
  2. Step 2: Convert to fraction form
    638.30/956.11 = 291.93/x
  3. Step 3: Cross multiply
    638.30x = 956.11 × 291.93
  4. Step 4: Simplify right side
    638.30x = 279,112.19
  5. Step 5: Solve for x
    x = 279,112.19/638.30
  6. Step 6: Final answer
    x = 437.27

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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.