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Finding the Fourth Proportional to 51.48, 77.20 and 15.40

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Solution

The fourth proportional to 51.48, 77.20 and 15.40 is: 23.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    51.48 : 77.20 = 15.40 : x
  2. Step 2: Convert to fraction form
    51.48/77.20 = 15.40/x
  3. Step 3: Cross multiply
    51.48x = 77.20 × 15.40
  4. Step 4: Simplify right side
    51.48x = 1,188.88
  5. Step 5: Solve for x
    x = 1,188.88/51.48
  6. Step 6: Final answer
    x = 23.09

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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.