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Finding the Fourth Proportional to 306.60, 422.58 and 208.32

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Solution

The fourth proportional to 306.60, 422.58 and 208.32 is: 287.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    306.60 : 422.58 = 208.32 : x
  2. Step 2: Convert to fraction form
    306.60/422.58 = 208.32/x
  3. Step 3: Cross multiply
    306.60x = 422.58 × 208.32
  4. Step 4: Simplify right side
    306.60x = 88,031.87
  5. Step 5: Solve for x
    x = 88,031.87/306.60
  6. Step 6: Final answer
    x = 287.12

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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.