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Finding the Fourth Proportional to 59.45, 81.99 and 47.72

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Solution

The fourth proportional to 59.45, 81.99 and 47.72 is: 65.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    59.45 : 81.99 = 47.72 : x
  2. Step 2: Convert to fraction form
    59.45/81.99 = 47.72/x
  3. Step 3: Cross multiply
    59.45x = 81.99 × 47.72
  4. Step 4: Simplify right side
    59.45x = 3,912.77
  5. Step 5: Solve for x
    x = 3,912.77/59.45
  6. Step 6: Final answer
    x = 65.82

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.