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Finding the Fourth Proportional to 1,106.78, 1,660.36 and 326.76

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Solution

The fourth proportional to 1,106.78, 1,660.36 and 326.76 is: 490.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,106.78 : 1,660.36 = 326.76 : x
  2. Step 2: Convert to fraction form
    1,106.78/1,660.36 = 326.76/x
  3. Step 3: Cross multiply
    1,106.78x = 1,660.36 × 326.76
  4. Step 4: Simplify right side
    1,106.78x = 542,539.23
  5. Step 5: Solve for x
    x = 542,539.23/1,106.78
  6. Step 6: Final answer
    x = 490.20

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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.