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Finding the Fourth Proportional to 137.99, 206.88 and 51.28

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Solution

The fourth proportional to 137.99, 206.88 and 51.28 is: 76.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    137.99 : 206.88 = 51.28 : x
  2. Step 2: Convert to fraction form
    137.99/206.88 = 51.28/x
  3. Step 3: Cross multiply
    137.99x = 206.88 × 51.28
  4. Step 4: Simplify right side
    137.99x = 10,607.52
  5. Step 5: Solve for x
    x = 10,607.52/137.99
  6. Step 6: Final answer
    x = 76.87

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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.