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Finding the Fourth Proportional to 312.12, 430.11 and 229.14

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Solution

The fourth proportional to 312.12, 430.11 and 229.14 is: 315.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    312.12 : 430.11 = 229.14 : x
  2. Step 2: Convert to fraction form
    312.12/430.11 = 229.14/x
  3. Step 3: Cross multiply
    312.12x = 430.11 × 229.14
  4. Step 4: Simplify right side
    312.12x = 98,555.41
  5. Step 5: Solve for x
    x = 98,555.41/312.12
  6. Step 6: Final answer
    x = 315.76

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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.