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Finding the Fourth Proportional to 312.12, 430.65 and 172.22

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Solution

The fourth proportional to 312.12, 430.65 and 172.22 is: 237.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    312.12 : 430.65 = 172.22 : x
  2. Step 2: Convert to fraction form
    312.12/430.65 = 172.22/x
  3. Step 3: Cross multiply
    312.12x = 430.65 × 172.22
  4. Step 4: Simplify right side
    312.12x = 74,164.39
  5. Step 5: Solve for x
    x = 74,164.39/312.12
  6. Step 6: Final answer
    x = 237.61

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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.