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Finding the Fourth Proportional to 1,722.36, 2,581.62 and 991.32

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Solution

The fourth proportional to 1,722.36, 2,581.62 and 991.32 is: 1,485.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,722.36 : 2,581.62 = 991.32 : x
  2. Step 2: Convert to fraction form
    1,722.36/2,581.62 = 991.32/x
  3. Step 3: Cross multiply
    1,722.36x = 2,581.62 × 991.32
  4. Step 4: Simplify right side
    1,722.36x = 2,559,211.54
  5. Step 5: Solve for x
    x = 2,559,211.54/1,722.36
  6. Step 6: Final answer
    x = 1,485.87

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.