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Finding the Fourth Proportional to 1,091.16, 1,507.28 and 871.65

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Solution

The fourth proportional to 1,091.16, 1,507.28 and 871.65 is: 1,204.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,091.16 : 1,507.28 = 871.65 : x
  2. Step 2: Convert to fraction form
    1,091.16/1,507.28 = 871.65/x
  3. Step 3: Cross multiply
    1,091.16x = 1,507.28 × 871.65
  4. Step 4: Simplify right side
    1,091.16x = 1,313,816.25
  5. Step 5: Solve for x
    x = 1,313,816.25/1,091.16
  6. Step 6: Final answer
    x = 1,204.05

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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.