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Finding the Fourth Proportional to 51.54, 76.88 and 45.48

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Solution

The fourth proportional to 51.54, 76.88 and 45.48 is: 67.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    51.54 : 76.88 = 45.48 : x
  2. Step 2: Convert to fraction form
    51.54/76.88 = 45.48/x
  3. Step 3: Cross multiply
    51.54x = 76.88 × 45.48
  4. Step 4: Simplify right side
    51.54x = 3,496.28
  5. Step 5: Solve for x
    x = 3,496.28/51.54
  6. Step 6: Final answer
    x = 67.84

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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.