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Finding the Fourth Proportional to 171.07, 256.61 and 74.81

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Solution

The fourth proportional to 171.07, 256.61 and 74.81 is: 112.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    171.07 : 256.61 = 74.81 : x
  2. Step 2: Convert to fraction form
    171.07/256.61 = 74.81/x
  3. Step 3: Cross multiply
    171.07x = 256.61 × 74.81
  4. Step 4: Simplify right side
    171.07x = 19,197.82
  5. Step 5: Solve for x
    x = 19,197.82/171.07
  6. Step 6: Final answer
    x = 112.22

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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.