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Finding the Fourth Proportional to 863.10, 1,294.65 and 644.40

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Solution

The fourth proportional to 863.10, 1,294.65 and 644.40 is: 966.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    863.10 : 1,294.65 = 644.40 : x
  2. Step 2: Convert to fraction form
    863.10/1,294.65 = 644.40/x
  3. Step 3: Cross multiply
    863.10x = 1,294.65 × 644.40
  4. Step 4: Simplify right side
    863.10x = 834,272.46
  5. Step 5: Solve for x
    x = 834,272.46/863.10
  6. Step 6: Final answer
    x = 966.60

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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.