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Finding the Fourth Proportional to 73.18, 109.78 and 42.76

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Solution

The fourth proportional to 73.18, 109.78 and 42.76 is: 64.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    73.18 : 109.78 = 42.76 : x
  2. Step 2: Convert to fraction form
    73.18/109.78 = 42.76/x
  3. Step 3: Cross multiply
    73.18x = 109.78 × 42.76
  4. Step 4: Simplify right side
    73.18x = 4,694.19
  5. Step 5: Solve for x
    x = 4,694.19/73.18
  6. Step 6: Final answer
    x = 64.15

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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.