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Finding the Fourth Proportional to 728.15, 1,091.76 and 317.07

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Solution

The fourth proportional to 728.15, 1,091.76 and 317.07 is: 475.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    728.15 : 1,091.76 = 317.07 : x
  2. Step 2: Convert to fraction form
    728.15/1,091.76 = 317.07/x
  3. Step 3: Cross multiply
    728.15x = 1,091.76 × 317.07
  4. Step 4: Simplify right side
    728.15x = 346,164.34
  5. Step 5: Solve for x
    x = 346,164.34/728.15
  6. Step 6: Final answer
    x = 475.41

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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.