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Finding the Fourth Proportional to 1,811.17, 2,716.80 and 987.40

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Solution

The fourth proportional to 1,811.17, 2,716.80 and 987.40 is: 1,481.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,811.17 : 2,716.80 = 987.40 : x
  2. Step 2: Convert to fraction form
    1,811.17/2,716.80 = 987.40/x
  3. Step 3: Cross multiply
    1,811.17x = 2,716.80 × 987.40
  4. Step 4: Simplify right side
    1,811.17x = 2,682,568.32
  5. Step 5: Solve for x
    x = 2,682,568.32/1,811.17
  6. Step 6: Final answer
    x = 1,481.12

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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.