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Finding the Fourth Proportional to 727.79, 1,091.78 and 240.77

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Solution

The fourth proportional to 727.79, 1,091.78 and 240.77 is: 361.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    727.79 : 1,091.78 = 240.77 : x
  2. Step 2: Convert to fraction form
    727.79/1,091.78 = 240.77/x
  3. Step 3: Cross multiply
    727.79x = 1,091.78 × 240.77
  4. Step 4: Simplify right side
    727.79x = 262,870.30
  5. Step 5: Solve for x
    x = 262,870.30/727.79
  6. Step 6: Final answer
    x = 361.19

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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.