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Finding the Fourth Proportional to 51.64, 77.40 and 28.79

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Solution

The fourth proportional to 51.64, 77.40 and 28.79 is: 43.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    51.64 : 77.40 = 28.79 : x
  2. Step 2: Convert to fraction form
    51.64/77.40 = 28.79/x
  3. Step 3: Cross multiply
    51.64x = 77.40 × 28.79
  4. Step 4: Simplify right side
    51.64x = 2,227.96
  5. Step 5: Solve for x
    x = 2,227.96/51.64
  6. Step 6: Final answer
    x = 43.15

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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.