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Finding the Fourth Proportional to 672.16, 1,008.38 and 261.24

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Solution

The fourth proportional to 672.16, 1,008.38 and 261.24 is: 391.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    672.16 : 1,008.38 = 261.24 : x
  2. Step 2: Convert to fraction form
    672.16/1,008.38 = 261.24/x
  3. Step 3: Cross multiply
    672.16x = 1,008.38 × 261.24
  4. Step 4: Simplify right side
    672.16x = 263,429.19
  5. Step 5: Solve for x
    x = 263,429.19/672.16
  6. Step 6: Final answer
    x = 391.91

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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.