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Finding the Fourth Proportional to 51, 76.52 and 20.57

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Solution

The fourth proportional to 51, 76.52 and 20.57 is: 30.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    51 : 76.52 = 20.57 : x
  2. Step 2: Convert to fraction form
    51/76.52 = 20.57/x
  3. Step 3: Cross multiply
    51x = 76.52 × 20.57
  4. Step 4: Simplify right side
    51x = 1,573.53
  5. Step 5: Solve for x
    x = 1,573.53/51
  6. Step 6: Final answer
    x = 30.85

Related Problems

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Similar ratio
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1.5x scale

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.