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Finding the Fourth Proportional to 1,091.68, 1,506.54 and 855.91

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Solution

The fourth proportional to 1,091.68, 1,506.54 and 855.91 is: 1,181.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,091.68 : 1,506.54 = 855.91 : x
  2. Step 2: Convert to fraction form
    1,091.68/1,506.54 = 855.91/x
  3. Step 3: Cross multiply
    1,091.68x = 1,506.54 × 855.91
  4. Step 4: Simplify right side
    1,091.68x = 1,289,462.65
  5. Step 5: Solve for x
    x = 1,289,462.65/1,091.68
  6. Step 6: Final answer
    x = 1,181.17

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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.