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Finding the Fourth Proportional to 291.30, 402.05 and 171.75

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Solution

The fourth proportional to 291.30, 402.05 and 171.75 is: 237.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    291.30 : 402.05 = 171.75 : x
  2. Step 2: Convert to fraction form
    291.30/402.05 = 171.75/x
  3. Step 3: Cross multiply
    291.30x = 402.05 × 171.75
  4. Step 4: Simplify right side
    291.30x = 69,052.09
  5. Step 5: Solve for x
    x = 69,052.09/291.30
  6. Step 6: Final answer
    x = 237.05

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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.