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Finding the Fourth Proportional to 672.39, 1,008.68 and 239.45

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Solution

The fourth proportional to 672.39, 1,008.68 and 239.45 is: 359.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    672.39 : 1,008.68 = 239.45 : x
  2. Step 2: Convert to fraction form
    672.39/1,008.68 = 239.45/x
  3. Step 3: Cross multiply
    672.39x = 1,008.68 × 239.45
  4. Step 4: Simplify right side
    672.39x = 241,522.19
  5. Step 5: Solve for x
    x = 241,522.19/672.39
  6. Step 6: Final answer
    x = 359.20

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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.