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Finding the Fourth Proportional to 1,231.80, 1,838.21 and 1,015.80

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Solution

The fourth proportional to 1,231.80, 1,838.21 and 1,015.80 is: 1,515.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,231.80 : 1,838.21 = 1,015.80 : x
  2. Step 2: Convert to fraction form
    1,231.80/1,838.21 = 1,015.80/x
  3. Step 3: Cross multiply
    1,231.80x = 1,838.21 × 1,015.80
  4. Step 4: Simplify right side
    1,231.80x = 1,867,253.72
  5. Step 5: Solve for x
    x = 1,867,253.72/1,231.80
  6. Step 6: Final answer
    x = 1,515.87

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.