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Finding the Fourth Proportional to 638.81, 881.56 and 373.42

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Solution

The fourth proportional to 638.81, 881.56 and 373.42 is: 515.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    638.81 : 881.56 = 373.42 : x
  2. Step 2: Convert to fraction form
    638.81/881.56 = 373.42/x
  3. Step 3: Cross multiply
    638.81x = 881.56 × 373.42
  4. Step 4: Simplify right side
    638.81x = 329,192.14
  5. Step 5: Solve for x
    x = 329,192.14/638.81
  6. Step 6: Final answer
    x = 515.32

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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.