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Finding the Fourth Proportional to 73.28, 109.90 and 61.72

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Solution

The fourth proportional to 73.28, 109.90 and 61.72 is: 92.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    73.28 : 109.90 = 61.72 : x
  2. Step 2: Convert to fraction form
    73.28/109.90 = 61.72/x
  3. Step 3: Cross multiply
    73.28x = 109.90 × 61.72
  4. Step 4: Simplify right side
    73.28x = 6,783.03
  5. Step 5: Solve for x
    x = 6,783.03/73.28
  6. Step 6: Final answer
    x = 92.56

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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.