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Finding the Fourth Proportional to 1,581.27, 2,181.92 and 991.59

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Solution

The fourth proportional to 1,581.27, 2,181.92 and 991.59 is: 1,368.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,581.27 : 2,181.92 = 991.59 : x
  2. Step 2: Convert to fraction form
    1,581.27/2,181.92 = 991.59/x
  3. Step 3: Cross multiply
    1,581.27x = 2,181.92 × 991.59
  4. Step 4: Simplify right side
    1,581.27x = 2,163,565.09
  5. Step 5: Solve for x
    x = 2,163,565.09/1,581.27
  6. Step 6: Final answer
    x = 1,368.25

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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.