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Finding the Fourth Proportional to 1,646.29, 2,469.40 and 672.40

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Solution

The fourth proportional to 1,646.29, 2,469.40 and 672.40 is: 1,008.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,646.29 : 2,469.40 = 672.40 : x
  2. Step 2: Convert to fraction form
    1,646.29/2,469.40 = 672.40/x
  3. Step 3: Cross multiply
    1,646.29x = 2,469.40 × 672.40
  4. Step 4: Simplify right side
    1,646.29x = 1,660,424.56
  5. Step 5: Solve for x
    x = 1,660,424.56/1,646.29
  6. Step 6: Final answer
    x = 1,008.59

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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.