Home / 1,191.80-1,787.70-326.11

Finding the Fourth Proportional to 1,191.80, 1,787.70 and 326.11

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Solution

The fourth proportional to 1,191.80, 1,787.70 and 326.11 is: 489.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,191.80 : 1,787.70 = 326.11 : x
  2. Step 2: Convert to fraction form
    1,191.80/1,787.70 = 326.11/x
  3. Step 3: Cross multiply
    1,191.80x = 1,787.70 × 326.11
  4. Step 4: Simplify right side
    1,191.80x = 582,986.95
  5. Step 5: Solve for x
    x = 582,986.95/1,191.80
  6. Step 6: Final answer
    x = 489.17

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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.