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Finding the Fourth Proportional to 70.63, 105.92 and 51.59

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Solution

The fourth proportional to 70.63, 105.92 and 51.59 is: 77.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    70.63 : 105.92 = 51.59 : x
  2. Step 2: Convert to fraction form
    70.63/105.92 = 51.59/x
  3. Step 3: Cross multiply
    70.63x = 105.92 × 51.59
  4. Step 4: Simplify right side
    70.63x = 5,464.90
  5. Step 5: Solve for x
    x = 5,464.90/70.63
  6. Step 6: Final answer
    x = 77.38

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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.