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Finding the Fourth Proportional to 105.12, 144.96 and 70.56

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Solution

The fourth proportional to 105.12, 144.96 and 70.56 is: 97.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    105.12 : 144.96 = 70.56 : x
  2. Step 2: Convert to fraction form
    105.12/144.96 = 70.56/x
  3. Step 3: Cross multiply
    105.12x = 144.96 × 70.56
  4. Step 4: Simplify right side
    105.12x = 10,228.38
  5. Step 5: Solve for x
    x = 10,228.38/105.12
  6. Step 6: Final answer
    x = 97.30

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.