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Finding the Fourth Proportional to 172.70, 261.09 and 172.70

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Solution

The fourth proportional to 172.70, 261.09 and 172.70 is: 261.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    172.70 : 261.09 = 172.70 : x
  2. Step 2: Convert to fraction form
    172.70/261.09 = 172.70/x
  3. Step 3: Cross multiply
    172.70x = 261.09 × 172.70
  4. Step 4: Simplify right side
    172.70x = 45,090.24
  5. Step 5: Solve for x
    x = 45,090.24/172.70
  6. Step 6: Final answer
    x = 261.09

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.