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Finding the Fourth Proportional to 622.61, 858.78 and 386.31

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Solution

The fourth proportional to 622.61, 858.78 and 386.31 is: 532.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    622.61 : 858.78 = 386.31 : x
  2. Step 2: Convert to fraction form
    622.61/858.78 = 386.31/x
  3. Step 3: Cross multiply
    622.61x = 858.78 × 386.31
  4. Step 4: Simplify right side
    622.61x = 331,755.30
  5. Step 5: Solve for x
    x = 331,755.30/622.61
  6. Step 6: Final answer
    x = 532.84

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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.