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Finding the Fourth Proportional to 2,288.56, 3,432.30 and 991

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Solution

The fourth proportional to 2,288.56, 3,432.30 and 991 is: 1,486.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,288.56 : 3,432.30 = 991 : x
  2. Step 2: Convert to fraction form
    2,288.56/3,432.30 = 991/x
  3. Step 3: Cross multiply
    2,288.56x = 3,432.30 × 991
  4. Step 4: Simplify right side
    2,288.56x = 3,401,409.30
  5. Step 5: Solve for x
    x = 3,401,409.30/2,288.56
  6. Step 6: Final answer
    x = 1,486.27

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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.