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Finding the Fourth Proportional to 921.57, 1,272.57 and 627.54

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Solution

The fourth proportional to 921.57, 1,272.57 and 627.54 is: 866.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    921.57 : 1,272.57 = 627.54 : x
  2. Step 2: Convert to fraction form
    921.57/1,272.57 = 627.54/x
  3. Step 3: Cross multiply
    921.57x = 1,272.57 × 627.54
  4. Step 4: Simplify right side
    921.57x = 798,588.58
  5. Step 5: Solve for x
    x = 798,588.58/921.57
  6. Step 6: Final answer
    x = 866.55

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.