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Finding the Fourth Proportional to 1,671, 2,507.22 and 987

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Solution

The fourth proportional to 1,671, 2,507.22 and 987 is: 1,480.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,671 : 2,507.22 = 987 : x
  2. Step 2: Convert to fraction form
    1,671/2,507.22 = 987/x
  3. Step 3: Cross multiply
    1,671x = 2,507.22 × 987
  4. Step 4: Simplify right side
    1,671x = 2,474,626.14
  5. Step 5: Solve for x
    x = 2,474,626.14/1,671
  6. Step 6: Final answer
    x = 1,480.93

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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.