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Finding the Fourth Proportional to 728.46, 1,085.33 and 712.06

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Solution

The fourth proportional to 728.46, 1,085.33 and 712.06 is: 1,060.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    728.46 : 1,085.33 = 712.06 : x
  2. Step 2: Convert to fraction form
    728.46/1,085.33 = 712.06/x
  3. Step 3: Cross multiply
    728.46x = 1,085.33 × 712.06
  4. Step 4: Simplify right side
    728.46x = 772,819.15
  5. Step 5: Solve for x
    x = 772,819.15/728.46
  6. Step 6: Final answer
    x = 1,060.89

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.