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Finding the Fourth Proportional to 1,108.65, 1,665.26 and 1,071.75

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Solution

The fourth proportional to 1,108.65, 1,665.26 and 1,071.75 is: 1,609.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,108.65 : 1,665.26 = 1,071.75 : x
  2. Step 2: Convert to fraction form
    1,108.65/1,665.26 = 1,071.75/x
  3. Step 3: Cross multiply
    1,108.65x = 1,665.26 × 1,071.75
  4. Step 4: Simplify right side
    1,108.65x = 1,784,737.05
  5. Step 5: Solve for x
    x = 1,784,737.05/1,108.65
  6. Step 6: Final answer
    x = 1,609.83

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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.