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Finding the Fourth Proportional to 51.12, 76.64 and 49.59

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Solution

The fourth proportional to 51.12, 76.64 and 49.59 is: 74.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    51.12 : 76.64 = 49.59 : x
  2. Step 2: Convert to fraction form
    51.12/76.64 = 49.59/x
  3. Step 3: Cross multiply
    51.12x = 76.64 × 49.59
  4. Step 4: Simplify right side
    51.12x = 3,800.65
  5. Step 5: Solve for x
    x = 3,800.65/51.12
  6. Step 6: Final answer
    x = 74.34

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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.