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Finding the Fourth Proportional to 70.07, 104.85 and 42.66

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Solution

The fourth proportional to 70.07, 104.85 and 42.66 is: 63.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    70.07 : 104.85 = 42.66 : x
  2. Step 2: Convert to fraction form
    70.07/104.85 = 42.66/x
  3. Step 3: Cross multiply
    70.07x = 104.85 × 42.66
  4. Step 4: Simplify right side
    70.07x = 4,472.90
  5. Step 5: Solve for x
    x = 4,472.90/70.07
  6. Step 6: Final answer
    x = 63.84

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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.