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Finding the Fourth Proportional to 1,689.39, 2,331.45 and 990.77

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Solution

The fourth proportional to 1,689.39, 2,331.45 and 990.77 is: 1,367.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,689.39 : 2,331.45 = 990.77 : x
  2. Step 2: Convert to fraction form
    1,689.39/2,331.45 = 990.77/x
  3. Step 3: Cross multiply
    1,689.39x = 2,331.45 × 990.77
  4. Step 4: Simplify right side
    1,689.39x = 2,309,919.06
  5. Step 5: Solve for x
    x = 2,309,919.06/1,689.39
  6. Step 6: Final answer
    x = 1,367.31

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1.5x scale

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.