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Finding the Fourth Proportional to 787.07, 1,180.61 and 209.95

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Solution

The fourth proportional to 787.07, 1,180.61 and 209.95 is: 314.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    787.07 : 1,180.61 = 209.95 : x
  2. Step 2: Convert to fraction form
    787.07/1,180.61 = 209.95/x
  3. Step 3: Cross multiply
    787.07x = 1,180.61 × 209.95
  4. Step 4: Simplify right side
    787.07x = 247,862.12
  5. Step 5: Solve for x
    x = 247,862.12/787.07
  6. Step 6: Final answer
    x = 314.92

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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.