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Finding the Fourth Proportional to 637.17, 878.92 and 400.74

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Solution

The fourth proportional to 637.17, 878.92 and 400.74 is: 552.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    637.17 : 878.92 = 400.74 : x
  2. Step 2: Convert to fraction form
    637.17/878.92 = 400.74/x
  3. Step 3: Cross multiply
    637.17x = 878.92 × 400.74
  4. Step 4: Simplify right side
    637.17x = 352,216.40
  5. Step 5: Solve for x
    x = 352,216.40/637.17
  6. Step 6: Final answer
    x = 552.79

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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.