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Finding the Fourth Proportional to 73.10, 109.40 and 61.56

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Solution

The fourth proportional to 73.10, 109.40 and 61.56 is: 92.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    73.10 : 109.40 = 61.56 : x
  2. Step 2: Convert to fraction form
    73.10/109.40 = 61.56/x
  3. Step 3: Cross multiply
    73.10x = 109.40 × 61.56
  4. Step 4: Simplify right side
    73.10x = 6,734.36
  5. Step 5: Solve for x
    x = 6,734.36/73.10
  6. Step 6: Final answer
    x = 92.12

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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.