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Finding the Fourth Proportional to 728.76, 1,093.11 and 317.90

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Solution

The fourth proportional to 728.76, 1,093.11 and 317.90 is: 476.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    728.76 : 1,093.11 = 317.90 : x
  2. Step 2: Convert to fraction form
    728.76/1,093.11 = 317.90/x
  3. Step 3: Cross multiply
    728.76x = 1,093.11 × 317.90
  4. Step 4: Simplify right side
    728.76x = 347,499.67
  5. Step 5: Solve for x
    x = 347,499.67/728.76
  6. Step 6: Final answer
    x = 476.84

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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.