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Finding the Fourth Proportional to 51.16, 76.56 and 47.12

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Solution

The fourth proportional to 51.16, 76.56 and 47.12 is: 70.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    51.16 : 76.56 = 47.12 : x
  2. Step 2: Convert to fraction form
    51.16/76.56 = 47.12/x
  3. Step 3: Cross multiply
    51.16x = 76.56 × 47.12
  4. Step 4: Simplify right side
    51.16x = 3,607.51
  5. Step 5: Solve for x
    x = 3,607.51/51.16
  6. Step 6: Final answer
    x = 70.51

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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.