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Finding the Fourth Proportional to 1,311.99, 1,967.91 and 338.14

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Solution

The fourth proportional to 1,311.99, 1,967.91 and 338.14 is: 507.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,311.99 : 1,967.91 = 338.14 : x
  2. Step 2: Convert to fraction form
    1,311.99/1,967.91 = 338.14/x
  3. Step 3: Cross multiply
    1,311.99x = 1,967.91 × 338.14
  4. Step 4: Simplify right side
    1,311.99x = 665,429.09
  5. Step 5: Solve for x
    x = 665,429.09/1,311.99
  6. Step 6: Final answer
    x = 507.19

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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.