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Finding the Fourth Proportional to 622.41, 858.78 and 401.42

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Solution

The fourth proportional to 622.41, 858.78 and 401.42 is: 553.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    622.41 : 858.78 = 401.42 : x
  2. Step 2: Convert to fraction form
    622.41/858.78 = 401.42/x
  3. Step 3: Cross multiply
    622.41x = 858.78 × 401.42
  4. Step 4: Simplify right side
    622.41x = 344,727.17
  5. Step 5: Solve for x
    x = 344,727.17/622.41
  6. Step 6: Final answer
    x = 553.86

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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.