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Finding the Fourth Proportional to 172.44, 258.36 and 139.76

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Solution

The fourth proportional to 172.44, 258.36 and 139.76 is: 209.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    172.44 : 258.36 = 139.76 : x
  2. Step 2: Convert to fraction form
    172.44/258.36 = 139.76/x
  3. Step 3: Cross multiply
    172.44x = 258.36 × 139.76
  4. Step 4: Simplify right side
    172.44x = 36,108.39
  5. Step 5: Solve for x
    x = 36,108.39/172.44
  6. Step 6: Final answer
    x = 209.40

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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.