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Finding the Fourth Proportional to 1,967.90, 2,951.86 and 872.78

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Solution

The fourth proportional to 1,967.90, 2,951.86 and 872.78 is: 1,309.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,967.90 : 2,951.86 = 872.78 : x
  2. Step 2: Convert to fraction form
    1,967.90/2,951.86 = 872.78/x
  3. Step 3: Cross multiply
    1,967.90x = 2,951.86 × 872.78
  4. Step 4: Simplify right side
    1,967.90x = 2,576,324.37
  5. Step 5: Solve for x
    x = 2,576,324.37/1,967.90
  6. Step 6: Final answer
    x = 1,309.17

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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.