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Finding the Fourth Proportional to 1,192.40, 1,788.40 and 326.51

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Solution

The fourth proportional to 1,192.40, 1,788.40 and 326.51 is: 489.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,192.40 : 1,788.40 = 326.51 : x
  2. Step 2: Convert to fraction form
    1,192.40/1,788.40 = 326.51/x
  3. Step 3: Cross multiply
    1,192.40x = 1,788.40 × 326.51
  4. Step 4: Simplify right side
    1,192.40x = 583,928.85
  5. Step 5: Solve for x
    x = 583,928.85/1,192.40
  6. Step 6: Final answer
    x = 489.71

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1.5x scale

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.