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Finding the Fourth Proportional to 892.40, 1,338.60 and 768.20

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Solution

The fourth proportional to 892.40, 1,338.60 and 768.20 is: 1,152.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    892.40 : 1,338.60 = 768.20 : x
  2. Step 2: Convert to fraction form
    892.40/1,338.60 = 768.20/x
  3. Step 3: Cross multiply
    892.40x = 1,338.60 × 768.20
  4. Step 4: Simplify right side
    892.40x = 1,028,312.52
  5. Step 5: Solve for x
    x = 1,028,312.52/892.40
  6. Step 6: Final answer
    x = 1,152.30

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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.