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Finding the Fourth Proportional to 1,109.65, 1,661.23 and 673.87

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Solution

The fourth proportional to 1,109.65, 1,661.23 and 673.87 is: 1,008.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,109.65 : 1,661.23 = 673.87 : x
  2. Step 2: Convert to fraction form
    1,109.65/1,661.23 = 673.87/x
  3. Step 3: Cross multiply
    1,109.65x = 1,661.23 × 673.87
  4. Step 4: Simplify right side
    1,109.65x = 1,119,453.06
  5. Step 5: Solve for x
    x = 1,119,453.06/1,109.65
  6. Step 6: Final answer
    x = 1,008.83

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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.