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Finding the Fourth Proportional to 70.28, 105.48 and 47.42

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Solution

The fourth proportional to 70.28, 105.48 and 47.42 is: 71.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    70.28 : 105.48 = 47.42 : x
  2. Step 2: Convert to fraction form
    70.28/105.48 = 47.42/x
  3. Step 3: Cross multiply
    70.28x = 105.48 × 47.42
  4. Step 4: Simplify right side
    70.28x = 5,001.86
  5. Step 5: Solve for x
    x = 5,001.86/70.28
  6. Step 6: Final answer
    x = 71.17

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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.