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Finding the Fourth Proportional to 963.90, 1,446.93 and 639.90

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Solution

The fourth proportional to 963.90, 1,446.93 and 639.90 is: 960.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    963.90 : 1,446.93 = 639.90 : x
  2. Step 2: Convert to fraction form
    963.90/1,446.93 = 639.90/x
  3. Step 3: Cross multiply
    963.90x = 1,446.93 × 639.90
  4. Step 4: Simplify right side
    963.90x = 925,890.51
  5. Step 5: Solve for x
    x = 925,890.51/963.90
  6. Step 6: Final answer
    x = 960.57

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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.