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Finding the Fourth Proportional to 920.50, 1,380.85 and 335.68

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Solution

The fourth proportional to 920.50, 1,380.85 and 335.68 is: 503.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    920.50 : 1,380.85 = 335.68 : x
  2. Step 2: Convert to fraction form
    920.50/1,380.85 = 335.68/x
  3. Step 3: Cross multiply
    920.50x = 1,380.85 × 335.68
  4. Step 4: Simplify right side
    920.50x = 463,519.44
  5. Step 5: Solve for x
    x = 463,519.44/920.50
  6. Step 6: Final answer
    x = 503.55

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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.