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Finding the Fourth Proportional to 727.80, 1,091.86 and 207.78

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Solution

The fourth proportional to 727.80, 1,091.86 and 207.78 is: 311.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    727.80 : 1,091.86 = 207.78 : x
  2. Step 2: Convert to fraction form
    727.80/1,091.86 = 207.78/x
  3. Step 3: Cross multiply
    727.80x = 1,091.86 × 207.78
  4. Step 4: Simplify right side
    727.80x = 226,866.67
  5. Step 5: Solve for x
    x = 226,866.67/727.80
  6. Step 6: Final answer
    x = 311.72

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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.