Home / 1,329.12-1,991.25-1,108.35

Finding the Fourth Proportional to 1,329.12, 1,991.25 and 1,108.35

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Solution

The fourth proportional to 1,329.12, 1,991.25 and 1,108.35 is: 1,660.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,329.12 : 1,991.25 = 1,108.35 : x
  2. Step 2: Convert to fraction form
    1,329.12/1,991.25 = 1,108.35/x
  3. Step 3: Cross multiply
    1,329.12x = 1,991.25 × 1,108.35
  4. Step 4: Simplify right side
    1,329.12x = 2,207,001.94
  5. Step 5: Solve for x
    x = 2,207,001.94/1,329.12
  6. Step 6: Final answer
    x = 1,660.50

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Double scale
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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.