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Finding the Fourth Proportional to 645.17, 963.90 and 630.59

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Solution

The fourth proportional to 645.17, 963.90 and 630.59 is: 942.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    645.17 : 963.90 = 630.59 : x
  2. Step 2: Convert to fraction form
    645.17/963.90 = 630.59/x
  3. Step 3: Cross multiply
    645.17x = 963.90 × 630.59
  4. Step 4: Simplify right side
    645.17x = 607,820.88
  5. Step 5: Solve for x
    x = 607,820.88/645.17
  6. Step 6: Final answer
    x = 942.12

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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.