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Finding the Fourth Proportional to 920.78, 1,380.54 and 481.76

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Solution

The fourth proportional to 920.78, 1,380.54 and 481.76 is: 722.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    920.78 : 1,380.54 = 481.76 : x
  2. Step 2: Convert to fraction form
    920.78/1,380.54 = 481.76/x
  3. Step 3: Cross multiply
    920.78x = 1,380.54 × 481.76
  4. Step 4: Simplify right side
    920.78x = 665,088.95
  5. Step 5: Solve for x
    x = 665,088.95/920.78
  6. Step 6: Final answer
    x = 722.31

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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.