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Finding the Fourth Proportional to 1,388.11, 2,082.74 and 607.71

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Solution

The fourth proportional to 1,388.11, 2,082.74 and 607.71 is: 911.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,388.11 : 2,082.74 = 607.71 : x
  2. Step 2: Convert to fraction form
    1,388.11/2,082.74 = 607.71/x
  3. Step 3: Cross multiply
    1,388.11x = 2,082.74 × 607.71
  4. Step 4: Simplify right side
    1,388.11x = 1,265,692.22
  5. Step 5: Solve for x
    x = 1,265,692.22/1,388.11
  6. Step 6: Final answer
    x = 911.81

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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.