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Finding the Fourth Proportional to 672.39, 1,008.06 and 261.30

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Solution

The fourth proportional to 672.39, 1,008.06 and 261.30 is: 391.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    672.39 : 1,008.06 = 261.30 : x
  2. Step 2: Convert to fraction form
    672.39/1,008.06 = 261.30/x
  3. Step 3: Cross multiply
    672.39x = 1,008.06 × 261.30
  4. Step 4: Simplify right side
    672.39x = 263,406.08
  5. Step 5: Solve for x
    x = 263,406.08/672.39
  6. Step 6: Final answer
    x = 391.75

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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.