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Finding the Fourth Proportional to 1,106.79, 1,659.93 and 326.80

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Solution

The fourth proportional to 1,106.79, 1,659.93 and 326.80 is: 490.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,106.79 : 1,659.93 = 326.80 : x
  2. Step 2: Convert to fraction form
    1,106.79/1,659.93 = 326.80/x
  3. Step 3: Cross multiply
    1,106.79x = 1,659.93 × 326.80
  4. Step 4: Simplify right side
    1,106.79x = 542,465.12
  5. Step 5: Solve for x
    x = 542,465.12/1,106.79
  6. Step 6: Final answer
    x = 490.12

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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.