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Finding the Fourth Proportional to 1,249.80, 1,722.78 and 987.36

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Solution

The fourth proportional to 1,249.80, 1,722.78 and 987.36 is: 1,361.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,249.80 : 1,722.78 = 987.36 : x
  2. Step 2: Convert to fraction form
    1,249.80/1,722.78 = 987.36/x
  3. Step 3: Cross multiply
    1,249.80x = 1,722.78 × 987.36
  4. Step 4: Simplify right side
    1,249.80x = 1,701,004.06
  5. Step 5: Solve for x
    x = 1,701,004.06/1,249.80
  6. Step 6: Final answer
    x = 1,361.02

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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.