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Finding the Fourth Proportional to 70.92, 105.45 and 70.20

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Solution

The fourth proportional to 70.92, 105.45 and 70.20 is: 104.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    70.92 : 105.45 = 70.20 : x
  2. Step 2: Convert to fraction form
    70.92/105.45 = 70.20/x
  3. Step 3: Cross multiply
    70.92x = 105.45 × 70.20
  4. Step 4: Simplify right side
    70.92x = 7,402.59
  5. Step 5: Solve for x
    x = 7,402.59/70.92
  6. Step 6: Final answer
    x = 104.38

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.