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Finding the Fourth Proportional to 725.32, 1,000.89 and 406.29

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Solution

The fourth proportional to 725.32, 1,000.89 and 406.29 is: 560.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    725.32 : 1,000.89 = 406.29 : x
  2. Step 2: Convert to fraction form
    725.32/1,000.89 = 406.29/x
  3. Step 3: Cross multiply
    725.32x = 1,000.89 × 406.29
  4. Step 4: Simplify right side
    725.32x = 406,648.51
  5. Step 5: Solve for x
    x = 406,648.51/725.32
  6. Step 6: Final answer
    x = 560.64

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.