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Finding the Fourth Proportional to 920.63, 1,380.60 and 304.15

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Solution

The fourth proportional to 920.63, 1,380.60 and 304.15 is: 456.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    920.63 : 1,380.60 = 304.15 : x
  2. Step 2: Convert to fraction form
    920.63/1,380.60 = 304.15/x
  3. Step 3: Cross multiply
    920.63x = 1,380.60 × 304.15
  4. Step 4: Simplify right side
    920.63x = 419,906.04
  5. Step 5: Solve for x
    x = 419,906.04/920.63
  6. Step 6: Final answer
    x = 456.11

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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.