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Finding the Fourth Proportional to 51.56, 76.89 and 47.64

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Solution

The fourth proportional to 51.56, 76.89 and 47.64 is: 71.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    51.56 : 76.89 = 47.64 : x
  2. Step 2: Convert to fraction form
    51.56/76.89 = 47.64/x
  3. Step 3: Cross multiply
    51.56x = 76.89 × 47.64
  4. Step 4: Simplify right side
    51.56x = 3,663.04
  5. Step 5: Solve for x
    x = 3,663.04/51.56
  6. Step 6: Final answer
    x = 71.04

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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.