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Finding the Fourth Proportional to 963.90, 1,330.41 and 627.21

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Solution

The fourth proportional to 963.90, 1,330.41 and 627.21 is: 865.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    963.90 : 1,330.41 = 627.21 : x
  2. Step 2: Convert to fraction form
    963.90/1,330.41 = 627.21/x
  3. Step 3: Cross multiply
    963.90x = 1,330.41 × 627.21
  4. Step 4: Simplify right side
    963.90x = 834,446.76
  5. Step 5: Solve for x
    x = 834,446.76/963.90
  6. Step 6: Final answer
    x = 865.70

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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.