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Finding the Fourth Proportional to 137.14, 205.72 and 45.80

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Solution

The fourth proportional to 137.14, 205.72 and 45.80 is: 68.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    137.14 : 205.72 = 45.80 : x
  2. Step 2: Convert to fraction form
    137.14/205.72 = 45.80/x
  3. Step 3: Cross multiply
    137.14x = 205.72 × 45.80
  4. Step 4: Simplify right side
    137.14x = 9,421.98
  5. Step 5: Solve for x
    x = 9,421.98/137.14
  6. Step 6: Final answer
    x = 68.70

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.