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Finding the Fourth Proportional to 171.72, 257.46 and 56.13

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Solution

The fourth proportional to 171.72, 257.46 and 56.13 is: 84.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    171.72 : 257.46 = 56.13 : x
  2. Step 2: Convert to fraction form
    171.72/257.46 = 56.13/x
  3. Step 3: Cross multiply
    171.72x = 257.46 × 56.13
  4. Step 4: Simplify right side
    171.72x = 14,451.23
  5. Step 5: Solve for x
    x = 14,451.23/171.72
  6. Step 6: Final answer
    x = 84.16

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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.