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Finding the Fourth Proportional to 312.09, 430.68 and 179.33

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Solution

The fourth proportional to 312.09, 430.68 and 179.33 is: 247.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    312.09 : 430.68 = 179.33 : x
  2. Step 2: Convert to fraction form
    312.09/430.68 = 179.33/x
  3. Step 3: Cross multiply
    312.09x = 430.68 × 179.33
  4. Step 4: Simplify right side
    312.09x = 77,233.84
  5. Step 5: Solve for x
    x = 77,233.84/312.09
  6. Step 6: Final answer
    x = 247.47

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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.