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Finding the Fourth Proportional to 70.76, 105.80 and 50.45

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Solution

The fourth proportional to 70.76, 105.80 and 50.45 is: 75.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    70.76 : 105.80 = 50.45 : x
  2. Step 2: Convert to fraction form
    70.76/105.80 = 50.45/x
  3. Step 3: Cross multiply
    70.76x = 105.80 × 50.45
  4. Step 4: Simplify right side
    70.76x = 5,336.83
  5. Step 5: Solve for x
    x = 5,336.83/70.76
  6. Step 6: Final answer
    x = 75.43

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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.