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Finding the Fourth Proportional to 642.04, 960.90 and 449.08

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Solution

The fourth proportional to 642.04, 960.90 and 449.08 is: 672.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    642.04 : 960.90 = 449.08 : x
  2. Step 2: Convert to fraction form
    642.04/960.90 = 449.08/x
  3. Step 3: Cross multiply
    642.04x = 960.90 × 449.08
  4. Step 4: Simplify right side
    642.04x = 431,520.97
  5. Step 5: Solve for x
    x = 431,520.97/642.04
  6. Step 6: Final answer
    x = 672.11

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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.