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Finding the Fourth Proportional to 642.88, 887.20 and 363.14

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Solution

The fourth proportional to 642.88, 887.20 and 363.14 is: 501.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    642.88 : 887.20 = 363.14 : x
  2. Step 2: Convert to fraction form
    642.88/887.20 = 363.14/x
  3. Step 3: Cross multiply
    642.88x = 887.20 × 363.14
  4. Step 4: Simplify right side
    642.88x = 322,177.81
  5. Step 5: Solve for x
    x = 322,177.81/642.88
  6. Step 6: Final answer
    x = 501.15

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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.