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Finding the Fourth Proportional to 312.53, 431.30 and 172.66

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Solution

The fourth proportional to 312.53, 431.30 and 172.66 is: 238.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    312.53 : 431.30 = 172.66 : x
  2. Step 2: Convert to fraction form
    312.53/431.30 = 172.66/x
  3. Step 3: Cross multiply
    312.53x = 431.30 × 172.66
  4. Step 4: Simplify right side
    312.53x = 74,468.26
  5. Step 5: Solve for x
    x = 74,468.26/312.53
  6. Step 6: Final answer
    x = 238.28

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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.