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Finding the Fourth Proportional to 247.80, 341.96 and 137.28

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Solution

The fourth proportional to 247.80, 341.96 and 137.28 is: 189.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    247.80 : 341.96 = 137.28 : x
  2. Step 2: Convert to fraction form
    247.80/341.96 = 137.28/x
  3. Step 3: Cross multiply
    247.80x = 341.96 × 137.28
  4. Step 4: Simplify right side
    247.80x = 46,945.89
  5. Step 5: Solve for x
    x = 46,945.89/247.80
  6. Step 6: Final answer
    x = 189.45

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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.