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Finding the Fourth Proportional to 921.80, 1,272.29 and 627.77

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Solution

The fourth proportional to 921.80, 1,272.29 and 627.77 is: 866.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    921.80 : 1,272.29 = 627.77 : x
  2. Step 2: Convert to fraction form
    921.80/1,272.29 = 627.77/x
  3. Step 3: Cross multiply
    921.80x = 1,272.29 × 627.77
  4. Step 4: Simplify right side
    921.80x = 798,695.99
  5. Step 5: Solve for x
    x = 798,695.99/921.80
  6. Step 6: Final answer
    x = 866.46

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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.