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Finding the Fourth Proportional to 1,665.05, 2,496.36 and 689.81

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Solution

The fourth proportional to 1,665.05, 2,496.36 and 689.81 is: 1,034.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,665.05 : 2,496.36 = 689.81 : x
  2. Step 2: Convert to fraction form
    1,665.05/2,496.36 = 689.81/x
  3. Step 3: Cross multiply
    1,665.05x = 2,496.36 × 689.81
  4. Step 4: Simplify right side
    1,665.05x = 1,722,014.09
  5. Step 5: Solve for x
    x = 1,722,014.09/1,665.05
  6. Step 6: Final answer
    x = 1,034.21

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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.