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Finding the Fourth Proportional to 1,091.43, 1,506.20 and 855.66

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Solution

The fourth proportional to 1,091.43, 1,506.20 and 855.66 is: 1,180.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,091.43 : 1,506.20 = 855.66 : x
  2. Step 2: Convert to fraction form
    1,091.43/1,506.20 = 855.66/x
  3. Step 3: Cross multiply
    1,091.43x = 1,506.20 × 855.66
  4. Step 4: Simplify right side
    1,091.43x = 1,288,790.81
  5. Step 5: Solve for x
    x = 1,288,790.81/1,091.43
  6. Step 6: Final answer
    x = 1,180.83

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.