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Finding the Fourth Proportional to 51.92, 71.60 and 39.64

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Solution

The fourth proportional to 51.92, 71.60 and 39.64 is: 54.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    51.92 : 71.60 = 39.64 : x
  2. Step 2: Convert to fraction form
    51.92/71.60 = 39.64/x
  3. Step 3: Cross multiply
    51.92x = 71.60 × 39.64
  4. Step 4: Simplify right side
    51.92x = 2,838.22
  5. Step 5: Solve for x
    x = 2,838.22/51.92
  6. Step 6: Final answer
    x = 54.67

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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.