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Finding the Fourth Proportional to 743.60, 1,115.76 and 728.84

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Solution

The fourth proportional to 743.60, 1,115.76 and 728.84 is: 1,093.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    743.60 : 1,115.76 = 728.84 : x
  2. Step 2: Convert to fraction form
    743.60/1,115.76 = 728.84/x
  3. Step 3: Cross multiply
    743.60x = 1,115.76 × 728.84
  4. Step 4: Simplify right side
    743.60x = 813,210.52
  5. Step 5: Solve for x
    x = 813,210.52/743.60
  6. Step 6: Final answer
    x = 1,093.61

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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.