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Finding the Fourth Proportional to 1,310.79, 1,965.97 and 1,238.50

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Solution

The fourth proportional to 1,310.79, 1,965.97 and 1,238.50 is: 1,857.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,310.79 : 1,965.97 = 1,238.50 : x
  2. Step 2: Convert to fraction form
    1,310.79/1,965.97 = 1,238.50/x
  3. Step 3: Cross multiply
    1,310.79x = 1,965.97 × 1,238.50
  4. Step 4: Simplify right side
    1,310.79x = 2,434,853.85
  5. Step 5: Solve for x
    x = 2,434,853.85/1,310.79
  6. Step 6: Final answer
    x = 1,857.55

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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.