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Finding the Fourth Proportional to 728.47, 1,091.76 and 295.39

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Solution

The fourth proportional to 728.47, 1,091.76 and 295.39 is: 442.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    728.47 : 1,091.76 = 295.39 : x
  2. Step 2: Convert to fraction form
    728.47/1,091.76 = 295.39/x
  3. Step 3: Cross multiply
    728.47x = 1,091.76 × 295.39
  4. Step 4: Simplify right side
    728.47x = 322,494.99
  5. Step 5: Solve for x
    x = 322,494.99/728.47
  6. Step 6: Final answer
    x = 442.70

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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.