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Finding the Fourth Proportional to 172.47, 257.48 and 142.09

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Solution

The fourth proportional to 172.47, 257.48 and 142.09 is: 212.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    172.47 : 257.48 = 142.09 : x
  2. Step 2: Convert to fraction form
    172.47/257.48 = 142.09/x
  3. Step 3: Cross multiply
    172.47x = 257.48 × 142.09
  4. Step 4: Simplify right side
    172.47x = 36,585.33
  5. Step 5: Solve for x
    x = 36,585.33/172.47
  6. Step 6: Final answer
    x = 212.13

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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.