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Finding the Fourth Proportional to 1,690.32, 2,331.92 and 991.36

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Solution

The fourth proportional to 1,690.32, 2,331.92 and 991.36 is: 1,367.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,690.32 : 2,331.92 = 991.36 : x
  2. Step 2: Convert to fraction form
    1,690.32/2,331.92 = 991.36/x
  3. Step 3: Cross multiply
    1,690.32x = 2,331.92 × 991.36
  4. Step 4: Simplify right side
    1,690.32x = 2,311,772.21
  5. Step 5: Solve for x
    x = 2,311,772.21/1,690.32
  6. Step 6: Final answer
    x = 1,367.65

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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.