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Finding the Fourth Proportional to 51.56, 76.98 and 45.42

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Solution

The fourth proportional to 51.56, 76.98 and 45.42 is: 67.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    51.56 : 76.98 = 45.42 : x
  2. Step 2: Convert to fraction form
    51.56/76.98 = 45.42/x
  3. Step 3: Cross multiply
    51.56x = 76.98 × 45.42
  4. Step 4: Simplify right side
    51.56x = 3,496.43
  5. Step 5: Solve for x
    x = 3,496.43/51.56
  6. Step 6: Final answer
    x = 67.81

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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.