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Finding the Fourth Proportional to 1,311.05, 1,966.14 and 1,228.02

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Solution

The fourth proportional to 1,311.05, 1,966.14 and 1,228.02 is: 1,841.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,311.05 : 1,966.14 = 1,228.02 : x
  2. Step 2: Convert to fraction form
    1,311.05/1,966.14 = 1,228.02/x
  3. Step 3: Cross multiply
    1,311.05x = 1,966.14 × 1,228.02
  4. Step 4: Simplify right side
    1,311.05x = 2,414,459.24
  5. Step 5: Solve for x
    x = 2,414,459.24/1,311.05
  6. Step 6: Final answer
    x = 1,841.63

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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.