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Finding the Fourth Proportional to 312.05, 430.61 and 172.17

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Solution

The fourth proportional to 312.05, 430.61 and 172.17 is: 237.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    312.05 : 430.61 = 172.17 : x
  2. Step 2: Convert to fraction form
    312.05/430.61 = 172.17/x
  3. Step 3: Cross multiply
    312.05x = 430.61 × 172.17
  4. Step 4: Simplify right side
    312.05x = 74,138.12
  5. Step 5: Solve for x
    x = 74,138.12/312.05
  6. Step 6: Final answer
    x = 237.58

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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.