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Finding the Fourth Proportional to 51.37, 76.90 and 38.58

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Solution

The fourth proportional to 51.37, 76.90 and 38.58 is: 57.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    51.37 : 76.90 = 38.58 : x
  2. Step 2: Convert to fraction form
    51.37/76.90 = 38.58/x
  3. Step 3: Cross multiply
    51.37x = 76.90 × 38.58
  4. Step 4: Simplify right side
    51.37x = 2,966.80
  5. Step 5: Solve for x
    x = 2,966.80/51.37
  6. Step 6: Final answer
    x = 57.75

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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.