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Finding the Fourth Proportional to 72.96, 109.44 and 40.96

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Solution

The fourth proportional to 72.96, 109.44 and 40.96 is: 61.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    72.96 : 109.44 = 40.96 : x
  2. Step 2: Convert to fraction form
    72.96/109.44 = 40.96/x
  3. Step 3: Cross multiply
    72.96x = 109.44 × 40.96
  4. Step 4: Simplify right side
    72.96x = 4,482.66
  5. Step 5: Solve for x
    x = 4,482.66/72.96
  6. Step 6: Final answer
    x = 61.44

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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.