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Finding the Fourth Proportional to 728.70, 1,092.96 and 208.74

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Solution

The fourth proportional to 728.70, 1,092.96 and 208.74 is: 313.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    728.70 : 1,092.96 = 208.74 : x
  2. Step 2: Convert to fraction form
    728.70/1,092.96 = 208.74/x
  3. Step 3: Cross multiply
    728.70x = 1,092.96 × 208.74
  4. Step 4: Simplify right side
    728.70x = 228,144.47
  5. Step 5: Solve for x
    x = 228,144.47/728.70
  6. Step 6: Final answer
    x = 313.08

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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.