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Finding the Fourth Proportional to 622.28, 858.34 and 400.88

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Solution

The fourth proportional to 622.28, 858.34 and 400.88 is: 552.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    622.28 : 858.34 = 400.88 : x
  2. Step 2: Convert to fraction form
    622.28/858.34 = 400.88/x
  3. Step 3: Cross multiply
    622.28x = 858.34 × 400.88
  4. Step 4: Simplify right side
    622.28x = 344,091.34
  5. Step 5: Solve for x
    x = 344,091.34/622.28
  6. Step 6: Final answer
    x = 552.95

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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.