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Finding the Fourth Proportional to 70.05, 104.87 and 57.90

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Solution

The fourth proportional to 70.05, 104.87 and 57.90 is: 86.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    70.05 : 104.87 = 57.90 : x
  2. Step 2: Convert to fraction form
    70.05/104.87 = 57.90/x
  3. Step 3: Cross multiply
    70.05x = 104.87 × 57.90
  4. Step 4: Simplify right side
    70.05x = 6,071.97
  5. Step 5: Solve for x
    x = 6,071.97/70.05
  6. Step 6: Final answer
    x = 86.68

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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.