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Finding the Fourth Proportional to 727.80, 1,091.65 and 207.81

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Solution

The fourth proportional to 727.80, 1,091.65 and 207.81 is: 311.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    727.80 : 1,091.65 = 207.81 : x
  2. Step 2: Convert to fraction form
    727.80/1,091.65 = 207.81/x
  3. Step 3: Cross multiply
    727.80x = 1,091.65 × 207.81
  4. Step 4: Simplify right side
    727.80x = 226,855.79
  5. Step 5: Solve for x
    x = 226,855.79/727.80
  6. Step 6: Final answer
    x = 311.70

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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.