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Finding the Fourth Proportional to 312.30, 430.99 and 172.43

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Solution

The fourth proportional to 312.30, 430.99 and 172.43 is: 237.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    312.30 : 430.99 = 172.43 : x
  2. Step 2: Convert to fraction form
    312.30/430.99 = 172.43/x
  3. Step 3: Cross multiply
    312.30x = 430.99 × 172.43
  4. Step 4: Simplify right side
    312.30x = 74,315.61
  5. Step 5: Solve for x
    x = 74,315.61/312.30
  6. Step 6: Final answer
    x = 237.96

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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.