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Finding the Fourth Proportional to 642.29, 887.99 and 447.26

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Solution

The fourth proportional to 642.29, 887.99 and 447.26 is: 618.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    642.29 : 887.99 = 447.26 : x
  2. Step 2: Convert to fraction form
    642.29/887.99 = 447.26/x
  3. Step 3: Cross multiply
    642.29x = 887.99 × 447.26
  4. Step 4: Simplify right side
    642.29x = 397,155.73
  5. Step 5: Solve for x
    x = 397,155.73/642.29
  6. Step 6: Final answer
    x = 618.35

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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.