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Finding the Fourth Proportional to 1,216.72, 1,679.16 and 751

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Solution

The fourth proportional to 1,216.72, 1,679.16 and 751 is: 1,036.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,216.72 : 1,679.16 = 751 : x
  2. Step 2: Convert to fraction form
    1,216.72/1,679.16 = 751/x
  3. Step 3: Cross multiply
    1,216.72x = 1,679.16 × 751
  4. Step 4: Simplify right side
    1,216.72x = 1,261,049.16
  5. Step 5: Solve for x
    x = 1,261,049.16/1,216.72
  6. Step 6: Final answer
    x = 1,036.43

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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.