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Finding the Fourth Proportional to 1,106.90, 1,660.35 and 326.91

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Solution

The fourth proportional to 1,106.90, 1,660.35 and 326.91 is: 490.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,106.90 : 1,660.35 = 326.91 : x
  2. Step 2: Convert to fraction form
    1,106.90/1,660.35 = 326.91/x
  3. Step 3: Cross multiply
    1,106.90x = 1,660.35 × 326.91
  4. Step 4: Simplify right side
    1,106.90x = 542,783.79
  5. Step 5: Solve for x
    x = 542,783.79/1,106.90
  6. Step 6: Final answer
    x = 490.36

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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.