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Finding the Fourth Proportional to 51.11, 76.30 and 47.45

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Solution

The fourth proportional to 51.11, 76.30 and 47.45 is: 70.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    51.11 : 76.30 = 47.45 : x
  2. Step 2: Convert to fraction form
    51.11/76.30 = 47.45/x
  3. Step 3: Cross multiply
    51.11x = 76.30 × 47.45
  4. Step 4: Simplify right side
    51.11x = 3,620.51
  5. Step 5: Solve for x
    x = 3,620.51/51.11
  6. Step 6: Final answer
    x = 70.84

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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.