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Finding the Fourth Proportional to 638.42, 881.04 and 358.66

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Solution

The fourth proportional to 638.42, 881.04 and 358.66 is: 494.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    638.42 : 881.04 = 358.66 : x
  2. Step 2: Convert to fraction form
    638.42/881.04 = 358.66/x
  3. Step 3: Cross multiply
    638.42x = 881.04 × 358.66
  4. Step 4: Simplify right side
    638.42x = 315,993.81
  5. Step 5: Solve for x
    x = 315,993.81/638.42
  6. Step 6: Final answer
    x = 494.96

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.