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Finding the Fourth Proportional to 728.53, 1,092.54 and 208.39

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Solution

The fourth proportional to 728.53, 1,092.54 and 208.39 is: 312.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    728.53 : 1,092.54 = 208.39 : x
  2. Step 2: Convert to fraction form
    728.53/1,092.54 = 208.39/x
  3. Step 3: Cross multiply
    728.53x = 1,092.54 × 208.39
  4. Step 4: Simplify right side
    728.53x = 227,670.39
  5. Step 5: Solve for x
    x = 227,670.39/728.53
  6. Step 6: Final answer
    x = 312.51

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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.