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Finding the Fourth Proportional to 1,689.09, 2,331.17 and 990.53

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Solution

The fourth proportional to 1,689.09, 2,331.17 and 990.53 is: 1,367.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,689.09 : 2,331.17 = 990.53 : x
  2. Step 2: Convert to fraction form
    1,689.09/2,331.17 = 990.53/x
  3. Step 3: Cross multiply
    1,689.09x = 2,331.17 × 990.53
  4. Step 4: Simplify right side
    1,689.09x = 2,309,088.87
  5. Step 5: Solve for x
    x = 2,309,088.87/1,689.09
  6. Step 6: Final answer
    x = 1,367.06

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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.