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Finding the Fourth Proportional to 247.81, 341.98 and 135.78

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Solution

The fourth proportional to 247.81, 341.98 and 135.78 is: 187.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    247.81 : 341.98 = 135.78 : x
  2. Step 2: Convert to fraction form
    247.81/341.98 = 135.78/x
  3. Step 3: Cross multiply
    247.81x = 341.98 × 135.78
  4. Step 4: Simplify right side
    247.81x = 46,434.04
  5. Step 5: Solve for x
    x = 46,434.04/247.81
  6. Step 6: Final answer
    x = 187.38

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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.