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Finding the Fourth Proportional to 728.12, 1,091.22 and 295.04

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Solution

The fourth proportional to 728.12, 1,091.22 and 295.04 is: 442.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    728.12 : 1,091.22 = 295.04 : x
  2. Step 2: Convert to fraction form
    728.12/1,091.22 = 295.04/x
  3. Step 3: Cross multiply
    728.12x = 1,091.22 × 295.04
  4. Step 4: Simplify right side
    728.12x = 321,953.55
  5. Step 5: Solve for x
    x = 321,953.55/728.12
  6. Step 6: Final answer
    x = 442.17

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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.