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Finding the Fourth Proportional to 1,149.65, 1,723.10 and 661.69

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Solution

The fourth proportional to 1,149.65, 1,723.10 and 661.69 is: 991.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,149.65 : 1,723.10 = 661.69 : x
  2. Step 2: Convert to fraction form
    1,149.65/1,723.10 = 661.69/x
  3. Step 3: Cross multiply
    1,149.65x = 1,723.10 × 661.69
  4. Step 4: Simplify right side
    1,149.65x = 1,140,158.04
  5. Step 5: Solve for x
    x = 1,140,158.04/1,149.65
  6. Step 6: Final answer
    x = 991.75

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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.