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Finding the Fourth Proportional to 172.64, 257.21 and 170.93

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Solution

The fourth proportional to 172.64, 257.21 and 170.93 is: 254.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    172.64 : 257.21 = 170.93 : x
  2. Step 2: Convert to fraction form
    172.64/257.21 = 170.93/x
  3. Step 3: Cross multiply
    172.64x = 257.21 × 170.93
  4. Step 4: Simplify right side
    172.64x = 43,964.91
  5. Step 5: Solve for x
    x = 43,964.91/172.64
  6. Step 6: Final answer
    x = 254.66

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.