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Finding the Fourth Proportional to 247.98, 342.21 and 137.45

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Solution

The fourth proportional to 247.98, 342.21 and 137.45 is: 189.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    247.98 : 342.21 = 137.45 : x
  2. Step 2: Convert to fraction form
    247.98/342.21 = 137.45/x
  3. Step 3: Cross multiply
    247.98x = 342.21 × 137.45
  4. Step 4: Simplify right side
    247.98x = 47,036.76
  5. Step 5: Solve for x
    x = 47,036.76/247.98
  6. Step 6: Final answer
    x = 189.68

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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.