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Finding the Fourth Proportional to 312, 430.14 and 238.18

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Solution

The fourth proportional to 312, 430.14 and 238.18 is: 328.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    312 : 430.14 = 238.18 : x
  2. Step 2: Convert to fraction form
    312/430.14 = 238.18/x
  3. Step 3: Cross multiply
    312x = 430.14 × 238.18
  4. Step 4: Simplify right side
    312x = 102,450.75
  5. Step 5: Solve for x
    x = 102,450.75/312
  6. Step 6: Final answer
    x = 328.37

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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.