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Finding the Fourth Proportional to 622.20, 858.42 and 474.60

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Solution

The fourth proportional to 622.20, 858.42 and 474.60 is: 654.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    622.20 : 858.42 = 474.60 : x
  2. Step 2: Convert to fraction form
    622.20/858.42 = 474.60/x
  3. Step 3: Cross multiply
    622.20x = 858.42 × 474.60
  4. Step 4: Simplify right side
    622.20x = 407,406.13
  5. Step 5: Solve for x
    x = 407,406.13/622.20
  6. Step 6: Final answer
    x = 654.78

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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.