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Finding the Fourth Proportional to 787.32, 1,180.17 and 299.70

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Solution

The fourth proportional to 787.32, 1,180.17 and 299.70 is: 449.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    787.32 : 1,180.17 = 299.70 : x
  2. Step 2: Convert to fraction form
    787.32/1,180.17 = 299.70/x
  3. Step 3: Cross multiply
    787.32x = 1,180.17 × 299.70
  4. Step 4: Simplify right side
    787.32x = 353,696.95
  5. Step 5: Solve for x
    x = 353,696.95/787.32
  6. Step 6: Final answer
    x = 449.24

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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.