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Finding the Fourth Proportional to 728.08, 1,091.72 and 511.84

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Solution

The fourth proportional to 728.08, 1,091.72 and 511.84 is: 767.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    728.08 : 1,091.72 = 511.84 : x
  2. Step 2: Convert to fraction form
    728.08/1,091.72 = 511.84/x
  3. Step 3: Cross multiply
    728.08x = 1,091.72 × 511.84
  4. Step 4: Simplify right side
    728.08x = 558,785.96
  5. Step 5: Solve for x
    x = 558,785.96/728.08
  6. Step 6: Final answer
    x = 767.48

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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.