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Finding the Fourth Proportional to 71.63, 107.42 and 51.28

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Solution

The fourth proportional to 71.63, 107.42 and 51.28 is: 76.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    71.63 : 107.42 = 51.28 : x
  2. Step 2: Convert to fraction form
    71.63/107.42 = 51.28/x
  3. Step 3: Cross multiply
    71.63x = 107.42 × 51.28
  4. Step 4: Simplify right side
    71.63x = 5,508.50
  5. Step 5: Solve for x
    x = 5,508.50/71.63
  6. Step 6: Final answer
    x = 76.90

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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.