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Finding the Fourth Proportional to 70.48, 105.76 and 42

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Solution

The fourth proportional to 70.48, 105.76 and 42 is: 63.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    70.48 : 105.76 = 42 : x
  2. Step 2: Convert to fraction form
    70.48/105.76 = 42/x
  3. Step 3: Cross multiply
    70.48x = 105.76 × 42
  4. Step 4: Simplify right side
    70.48x = 4,441.92
  5. Step 5: Solve for x
    x = 4,441.92/70.48
  6. Step 6: Final answer
    x = 63.02

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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.