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Finding the Fourth Proportional to 639.13, 883.57 and 633.28

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Solution

The fourth proportional to 639.13, 883.57 and 633.28 is: 875.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    639.13 : 883.57 = 633.28 : x
  2. Step 2: Convert to fraction form
    639.13/883.57 = 633.28/x
  3. Step 3: Cross multiply
    639.13x = 883.57 × 633.28
  4. Step 4: Simplify right side
    639.13x = 559,546.42
  5. Step 5: Solve for x
    x = 559,546.42/639.13
  6. Step 6: Final answer
    x = 875.48

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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.