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Finding the Fourth Proportional to 787.78, 1,180.98 and 301.18

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Solution

The fourth proportional to 787.78, 1,180.98 and 301.18 is: 451.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    787.78 : 1,180.98 = 301.18 : x
  2. Step 2: Convert to fraction form
    787.78/1,180.98 = 301.18/x
  3. Step 3: Cross multiply
    787.78x = 1,180.98 × 301.18
  4. Step 4: Simplify right side
    787.78x = 355,687.56
  5. Step 5: Solve for x
    x = 355,687.56/787.78
  6. Step 6: Final answer
    x = 451.51

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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.