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Finding the Fourth Proportional to 920.54, 1,380.77 and 627.31

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Solution

The fourth proportional to 920.54, 1,380.77 and 627.31 is: 940.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    920.54 : 1,380.77 = 627.31 : x
  2. Step 2: Convert to fraction form
    920.54/1,380.77 = 627.31/x
  3. Step 3: Cross multiply
    920.54x = 1,380.77 × 627.31
  4. Step 4: Simplify right side
    920.54x = 866,165.89
  5. Step 5: Solve for x
    x = 866,165.89/920.54
  6. Step 6: Final answer
    x = 940.93

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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.