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Finding the Fourth Proportional to 725.04, 1,085.52 and 543.28

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Solution

The fourth proportional to 725.04, 1,085.52 and 543.28 is: 813.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    725.04 : 1,085.52 = 543.28 : x
  2. Step 2: Convert to fraction form
    725.04/1,085.52 = 543.28/x
  3. Step 3: Cross multiply
    725.04x = 1,085.52 × 543.28
  4. Step 4: Simplify right side
    725.04x = 589,741.31
  5. Step 5: Solve for x
    x = 589,741.31/725.04
  6. Step 6: Final answer
    x = 813.39

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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.