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Finding the Fourth Proportional to 105.12, 157.68 and 74.88

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Solution

The fourth proportional to 105.12, 157.68 and 74.88 is: 112.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    105.12 : 157.68 = 74.88 : x
  2. Step 2: Convert to fraction form
    105.12/157.68 = 74.88/x
  3. Step 3: Cross multiply
    105.12x = 157.68 × 74.88
  4. Step 4: Simplify right side
    105.12x = 11,807.08
  5. Step 5: Solve for x
    x = 11,807.08/105.12
  6. Step 6: Final answer
    x = 112.32

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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.