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Finding the Fourth Proportional to 622.68, 858.97 and 386.56

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Solution

The fourth proportional to 622.68, 858.97 and 386.56 is: 533.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    622.68 : 858.97 = 386.56 : x
  2. Step 2: Convert to fraction form
    622.68/858.97 = 386.56/x
  3. Step 3: Cross multiply
    622.68x = 858.97 × 386.56
  4. Step 4: Simplify right side
    622.68x = 332,043.44
  5. Step 5: Solve for x
    x = 332,043.44/622.68
  6. Step 6: Final answer
    x = 533.25

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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.