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Finding the Fourth Proportional to 73.15, 109.16 and 72.65

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Solution

The fourth proportional to 73.15, 109.16 and 72.65 is: 108.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    73.15 : 109.16 = 72.65 : x
  2. Step 2: Convert to fraction form
    73.15/109.16 = 72.65/x
  3. Step 3: Cross multiply
    73.15x = 109.16 × 72.65
  4. Step 4: Simplify right side
    73.15x = 7,930.14
  5. Step 5: Solve for x
    x = 7,930.14/73.15
  6. Step 6: Final answer
    x = 108.40

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.