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Finding the Fourth Proportional to 1,868.72, 2,576.68 and 1,239.76

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Solution

The fourth proportional to 1,868.72, 2,576.68 and 1,239.76 is: 1,709.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,868.72 : 2,576.68 = 1,239.76 : x
  2. Step 2: Convert to fraction form
    1,868.72/2,576.68 = 1,239.76/x
  3. Step 3: Cross multiply
    1,868.72x = 2,576.68 × 1,239.76
  4. Step 4: Simplify right side
    1,868.72x = 3,194,464.80
  5. Step 5: Solve for x
    x = 3,194,464.80/1,868.72
  6. Step 6: Final answer
    x = 1,709.44

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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.