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Finding the Fourth Proportional to 172, 257.86 and 74.51

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Solution

The fourth proportional to 172, 257.86 and 74.51 is: 111.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    172 : 257.86 = 74.51 : x
  2. Step 2: Convert to fraction form
    172/257.86 = 74.51/x
  3. Step 3: Cross multiply
    172x = 257.86 × 74.51
  4. Step 4: Simplify right side
    172x = 19,213.15
  5. Step 5: Solve for x
    x = 19,213.15/172
  6. Step 6: Final answer
    x = 111.70

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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.