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Finding the Fourth Proportional to 672.14, 1,008.49 and 412.16

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Solution

The fourth proportional to 672.14, 1,008.49 and 412.16 is: 618.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    672.14 : 1,008.49 = 412.16 : x
  2. Step 2: Convert to fraction form
    672.14/1,008.49 = 412.16/x
  3. Step 3: Cross multiply
    672.14x = 1,008.49 × 412.16
  4. Step 4: Simplify right side
    672.14x = 415,654.20
  5. Step 5: Solve for x
    x = 415,654.20/672.14
  6. Step 6: Final answer
    x = 618.40

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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.