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Finding the Fourth Proportional to 728.56, 1,092.68 and 208.56

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Solution

The fourth proportional to 728.56, 1,092.68 and 208.56 is: 312.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    728.56 : 1,092.68 = 208.56 : x
  2. Step 2: Convert to fraction form
    728.56/1,092.68 = 208.56/x
  3. Step 3: Cross multiply
    728.56x = 1,092.68 × 208.56
  4. Step 4: Simplify right side
    728.56x = 227,892.67
  5. Step 5: Solve for x
    x = 227,892.67/728.56
  6. Step 6: Final answer
    x = 312.80

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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.