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Finding the Fourth Proportional to 639.16, 958.74 and 206.32

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Solution

The fourth proportional to 639.16, 958.74 and 206.32 is: 309.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    639.16 : 958.74 = 206.32 : x
  2. Step 2: Convert to fraction form
    639.16/958.74 = 206.32/x
  3. Step 3: Cross multiply
    639.16x = 958.74 × 206.32
  4. Step 4: Simplify right side
    639.16x = 197,807.24
  5. Step 5: Solve for x
    x = 197,807.24/639.16
  6. Step 6: Final answer
    x = 309.48

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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.