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Finding the Fourth Proportional to 642.25, 963.40 and 368.22

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Solution

The fourth proportional to 642.25, 963.40 and 368.22 is: 552.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    642.25 : 963.40 = 368.22 : x
  2. Step 2: Convert to fraction form
    642.25/963.40 = 368.22/x
  3. Step 3: Cross multiply
    642.25x = 963.40 × 368.22
  4. Step 4: Simplify right side
    642.25x = 354,743.15
  5. Step 5: Solve for x
    x = 354,743.15/642.25
  6. Step 6: Final answer
    x = 552.34

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.