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Finding the Fourth Proportional to 638.44, 956.94 and 291.40

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Solution

The fourth proportional to 638.44, 956.94 and 291.40 is: 436.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    638.44 : 956.94 = 291.40 : x
  2. Step 2: Convert to fraction form
    638.44/956.94 = 291.40/x
  3. Step 3: Cross multiply
    638.44x = 956.94 × 291.40
  4. Step 4: Simplify right side
    638.44x = 278,852.32
  5. Step 5: Solve for x
    x = 278,852.32/638.44
  6. Step 6: Final answer
    x = 436.77

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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.