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Finding the Fourth Proportional to 51.98, 77.78 and 47.12

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Solution

The fourth proportional to 51.98, 77.78 and 47.12 is: 70.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    51.98 : 77.78 = 47.12 : x
  2. Step 2: Convert to fraction form
    51.98/77.78 = 47.12/x
  3. Step 3: Cross multiply
    51.98x = 77.78 × 47.12
  4. Step 4: Simplify right side
    51.98x = 3,664.99
  5. Step 5: Solve for x
    x = 3,664.99/51.98
  6. Step 6: Final answer
    x = 70.51

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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.