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Finding the Fourth Proportional to 637.79, 880.12 and 401.78

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Solution

The fourth proportional to 637.79, 880.12 and 401.78 is: 554.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    637.79 : 880.12 = 401.78 : x
  2. Step 2: Convert to fraction form
    637.79/880.12 = 401.78/x
  3. Step 3: Cross multiply
    637.79x = 880.12 × 401.78
  4. Step 4: Simplify right side
    637.79x = 353,610.11
  5. Step 5: Solve for x
    x = 353,610.11/637.79
  6. Step 6: Final answer
    x = 554.43

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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.