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Finding the Fourth Proportional to 1,249.19, 1,872.36 and 761.16

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Solution

The fourth proportional to 1,249.19, 1,872.36 and 761.16 is: 1,140.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,249.19 : 1,872.36 = 761.16 : x
  2. Step 2: Convert to fraction form
    1,249.19/1,872.36 = 761.16/x
  3. Step 3: Cross multiply
    1,249.19x = 1,872.36 × 761.16
  4. Step 4: Simplify right side
    1,249.19x = 1,425,165.54
  5. Step 5: Solve for x
    x = 1,425,165.54/1,249.19
  6. Step 6: Final answer
    x = 1,140.88

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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.