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Finding the Fourth Proportional to 271.15, 374.18 and 172.90

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Solution

The fourth proportional to 271.15, 374.18 and 172.90 is: 238.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    271.15 : 374.18 = 172.90 : x
  2. Step 2: Convert to fraction form
    271.15/374.18 = 172.90/x
  3. Step 3: Cross multiply
    271.15x = 374.18 × 172.90
  4. Step 4: Simplify right side
    271.15x = 64,695.33
  5. Step 5: Solve for x
    x = 64,695.33/271.15
  6. Step 6: Final answer
    x = 238.60

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.