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Finding the Fourth Proportional to 622.42, 858.60 and 386.29

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Solution

The fourth proportional to 622.42, 858.60 and 386.29 is: 532.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    622.42 : 858.60 = 386.29 : x
  2. Step 2: Convert to fraction form
    622.42/858.60 = 386.29/x
  3. Step 3: Cross multiply
    622.42x = 858.60 × 386.29
  4. Step 4: Simplify right side
    622.42x = 331,668.59
  5. Step 5: Solve for x
    x = 331,668.59/622.42
  6. Step 6: Final answer
    x = 532.87

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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.