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Finding the Fourth Proportional to 725.22, 1,000.89 and 430.65

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Solution

The fourth proportional to 725.22, 1,000.89 and 430.65 is: 594.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    725.22 : 1,000.89 = 430.65 : x
  2. Step 2: Convert to fraction form
    725.22/1,000.89 = 430.65/x
  3. Step 3: Cross multiply
    725.22x = 1,000.89 × 430.65
  4. Step 4: Simplify right side
    725.22x = 431,033.28
  5. Step 5: Solve for x
    x = 431,033.28/725.22
  6. Step 6: Final answer
    x = 594.35

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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.