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Finding the Fourth Proportional to 312.31, 430.96 and 172.43

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Solution

The fourth proportional to 312.31, 430.96 and 172.43 is: 237.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    312.31 : 430.96 = 172.43 : x
  2. Step 2: Convert to fraction form
    312.31/430.96 = 172.43/x
  3. Step 3: Cross multiply
    312.31x = 430.96 × 172.43
  4. Step 4: Simplify right side
    312.31x = 74,307.85
  5. Step 5: Solve for x
    x = 74,307.85/312.31
  6. Step 6: Final answer
    x = 237.93

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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.