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Finding the Fourth Proportional to 291.64, 402.59 and 221.71

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Solution

The fourth proportional to 291.64, 402.59 and 221.71 is: 306.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    291.64 : 402.59 = 221.71 : x
  2. Step 2: Convert to fraction form
    291.64/402.59 = 221.71/x
  3. Step 3: Cross multiply
    291.64x = 402.59 × 221.71
  4. Step 4: Simplify right side
    291.64x = 89,258.23
  5. Step 5: Solve for x
    x = 89,258.23/291.64
  6. Step 6: Final answer
    x = 306.06

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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.