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Finding the Fourth Proportional to 639.06, 954.26 and 635.20

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Solution

The fourth proportional to 639.06, 954.26 and 635.20 is: 948.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    639.06 : 954.26 = 635.20 : x
  2. Step 2: Convert to fraction form
    639.06/954.26 = 635.20/x
  3. Step 3: Cross multiply
    639.06x = 954.26 × 635.20
  4. Step 4: Simplify right side
    639.06x = 606,145.95
  5. Step 5: Solve for x
    x = 606,145.95/639.06
  6. Step 6: Final answer
    x = 948.50

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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.