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Finding the Fourth Proportional to 1,581.32, 2,181.66 and 992

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Solution

The fourth proportional to 1,581.32, 2,181.66 and 992 is: 1,368.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,581.32 : 2,181.66 = 992 : x
  2. Step 2: Convert to fraction form
    1,581.32/2,181.66 = 992/x
  3. Step 3: Cross multiply
    1,581.32x = 2,181.66 × 992
  4. Step 4: Simplify right side
    1,581.32x = 2,164,206.72
  5. Step 5: Solve for x
    x = 2,164,206.72/1,581.32
  6. Step 6: Final answer
    x = 1,368.61

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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.