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Finding the Fourth Proportional to 1,815, 2,504.70 and 987

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Solution

The fourth proportional to 1,815, 2,504.70 and 987 is: 1,362.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,815 : 2,504.70 = 987 : x
  2. Step 2: Convert to fraction form
    1,815/2,504.70 = 987/x
  3. Step 3: Cross multiply
    1,815x = 2,504.70 × 987
  4. Step 4: Simplify right side
    1,815x = 2,472,138.90
  5. Step 5: Solve for x
    x = 2,472,138.90/1,815
  6. Step 6: Final answer
    x = 1,362.06

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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.