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Finding the Fourth Proportional to 638.54, 881.36 and 373.21

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Solution

The fourth proportional to 638.54, 881.36 and 373.21 is: 515.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    638.54 : 881.36 = 373.21 : x
  2. Step 2: Convert to fraction form
    638.54/881.36 = 373.21/x
  3. Step 3: Cross multiply
    638.54x = 881.36 × 373.21
  4. Step 4: Simplify right side
    638.54x = 328,932.37
  5. Step 5: Solve for x
    x = 328,932.37/638.54
  6. Step 6: Final answer
    x = 515.13

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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.