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Finding the Fourth Proportional to 728.46, 1,091.43 and 317.37

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Solution

The fourth proportional to 728.46, 1,091.43 and 317.37 is: 475.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    728.46 : 1,091.43 = 317.37 : x
  2. Step 2: Convert to fraction form
    728.46/1,091.43 = 317.37/x
  3. Step 3: Cross multiply
    728.46x = 1,091.43 × 317.37
  4. Step 4: Simplify right side
    728.46x = 346,387.14
  5. Step 5: Solve for x
    x = 346,387.14/728.46
  6. Step 6: Final answer
    x = 475.51

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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.