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Finding the Fourth Proportional to 171.47, 257.10 and 68.77

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Solution

The fourth proportional to 171.47, 257.10 and 68.77 is: 103.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    171.47 : 257.10 = 68.77 : x
  2. Step 2: Convert to fraction form
    171.47/257.10 = 68.77/x
  3. Step 3: Cross multiply
    171.47x = 257.10 × 68.77
  4. Step 4: Simplify right side
    171.47x = 17,679.14
  5. Step 5: Solve for x
    x = 17,679.14/171.47
  6. Step 6: Final answer
    x = 103.11

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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.