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Finding the Fourth Proportional to 622.28, 857.99 and 386.17

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Solution

The fourth proportional to 622.28, 857.99 and 386.17 is: 532.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    622.28 : 857.99 = 386.17 : x
  2. Step 2: Convert to fraction form
    622.28/857.99 = 386.17/x
  3. Step 3: Cross multiply
    622.28x = 857.99 × 386.17
  4. Step 4: Simplify right side
    622.28x = 331,328.82
  5. Step 5: Solve for x
    x = 331,328.82/622.28
  6. Step 6: Final answer
    x = 532.44

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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.