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Finding the Fourth Proportional to 643.44, 960.40 and 627.90

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Solution

The fourth proportional to 643.44, 960.40 and 627.90 is: 937.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    643.44 : 960.40 = 627.90 : x
  2. Step 2: Convert to fraction form
    643.44/960.40 = 627.90/x
  3. Step 3: Cross multiply
    643.44x = 960.40 × 627.90
  4. Step 4: Simplify right side
    643.44x = 603,032.02
  5. Step 5: Solve for x
    x = 603,032.02/643.44
  6. Step 6: Final answer
    x = 937.20

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.