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Finding the Fourth Proportional to 639.70, 953.96 and 633.86

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Solution

The fourth proportional to 639.70, 953.96 and 633.86 is: 945.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    639.70 : 953.96 = 633.86 : x
  2. Step 2: Convert to fraction form
    639.70/953.96 = 633.86/x
  3. Step 3: Cross multiply
    639.70x = 953.96 × 633.86
  4. Step 4: Simplify right side
    639.70x = 604,678.09
  5. Step 5: Solve for x
    x = 604,678.09/639.70
  6. Step 6: Final answer
    x = 945.25

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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.