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Finding the Fourth Proportional to 51.68, 76.87 and 51.05

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Solution

The fourth proportional to 51.68, 76.87 and 51.05 is: 75.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    51.68 : 76.87 = 51.05 : x
  2. Step 2: Convert to fraction form
    51.68/76.87 = 51.05/x
  3. Step 3: Cross multiply
    51.68x = 76.87 × 51.05
  4. Step 4: Simplify right side
    51.68x = 3,924.21
  5. Step 5: Solve for x
    x = 3,924.21/51.68
  6. Step 6: Final answer
    x = 75.93

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.