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Finding the Fourth Proportional to 2,487.54, 3,431.64 and 1,989

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Solution

The fourth proportional to 2,487.54, 3,431.64 and 1,989 is: 2,743.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,487.54 : 3,431.64 = 1,989 : x
  2. Step 2: Convert to fraction form
    2,487.54/3,431.64 = 1,989/x
  3. Step 3: Cross multiply
    2,487.54x = 3,431.64 × 1,989
  4. Step 4: Simplify right side
    2,487.54x = 6,825,531.96
  5. Step 5: Solve for x
    x = 6,825,531.96/2,487.54
  6. Step 6: Final answer
    x = 2,743.89

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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.