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Finding the Fourth Proportional to 809.52, 1,214.28 and 728.70

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Solution

The fourth proportional to 809.52, 1,214.28 and 728.70 is: 1,093.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    809.52 : 1,214.28 = 728.70 : x
  2. Step 2: Convert to fraction form
    809.52/1,214.28 = 728.70/x
  3. Step 3: Cross multiply
    809.52x = 1,214.28 × 728.70
  4. Step 4: Simplify right side
    809.52x = 884,845.84
  5. Step 5: Solve for x
    x = 884,845.84/809.52
  6. Step 6: Final answer
    x = 1,093.05

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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.