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Finding the Fourth Proportional to 920.38, 1,380.40 and 262.30

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Solution

The fourth proportional to 920.38, 1,380.40 and 262.30 is: 393.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    920.38 : 1,380.40 = 262.30 : x
  2. Step 2: Convert to fraction form
    920.38/1,380.40 = 262.30/x
  3. Step 3: Cross multiply
    920.38x = 1,380.40 × 262.30
  4. Step 4: Simplify right side
    920.38x = 362,078.92
  5. Step 5: Solve for x
    x = 362,078.92/920.38
  6. Step 6: Final answer
    x = 393.40

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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.