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Finding the Fourth Proportional to 312.11, 430.70 and 172.22

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Solution

The fourth proportional to 312.11, 430.70 and 172.22 is: 237.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    312.11 : 430.70 = 172.22 : x
  2. Step 2: Convert to fraction form
    312.11/430.70 = 172.22/x
  3. Step 3: Cross multiply
    312.11x = 430.70 × 172.22
  4. Step 4: Simplify right side
    312.11x = 74,175.15
  5. Step 5: Solve for x
    x = 74,175.15/312.11
  6. Step 6: Final answer
    x = 237.66

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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.