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Finding the Fourth Proportional to 672.36, 1,008.62 and 261.43

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Solution

The fourth proportional to 672.36, 1,008.62 and 261.43 is: 392.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    672.36 : 1,008.62 = 261.43 : x
  2. Step 2: Convert to fraction form
    672.36/1,008.62 = 261.43/x
  3. Step 3: Cross multiply
    672.36x = 1,008.62 × 261.43
  4. Step 4: Simplify right side
    672.36x = 263,683.53
  5. Step 5: Solve for x
    x = 263,683.53/672.36
  6. Step 6: Final answer
    x = 392.18

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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.