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Finding the Fourth Proportional to 622.44, 858.80 and 386.28

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Solution

The fourth proportional to 622.44, 858.80 and 386.28 is: 532.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    622.44 : 858.80 = 386.28 : x
  2. Step 2: Convert to fraction form
    622.44/858.80 = 386.28/x
  3. Step 3: Cross multiply
    622.44x = 858.80 × 386.28
  4. Step 4: Simplify right side
    622.44x = 331,735.12
  5. Step 5: Solve for x
    x = 331,735.12/622.44
  6. Step 6: Final answer
    x = 532.96

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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.