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Finding the Fourth Proportional to 171.10, 256.97 and 145.45

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Solution

The fourth proportional to 171.10, 256.97 and 145.45 is: 218.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    171.10 : 256.97 = 145.45 : x
  2. Step 2: Convert to fraction form
    171.10/256.97 = 145.45/x
  3. Step 3: Cross multiply
    171.10x = 256.97 × 145.45
  4. Step 4: Simplify right side
    171.10x = 37,376.29
  5. Step 5: Solve for x
    x = 37,376.29/171.10
  6. Step 6: Final answer
    x = 218.45

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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.