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Finding the Fourth Proportional to 73.08, 109.45 and 66.70

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Solution

The fourth proportional to 73.08, 109.45 and 66.70 is: 99.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    73.08 : 109.45 = 66.70 : x
  2. Step 2: Convert to fraction form
    73.08/109.45 = 66.70/x
  3. Step 3: Cross multiply
    73.08x = 109.45 × 66.70
  4. Step 4: Simplify right side
    73.08x = 7,300.54
  5. Step 5: Solve for x
    x = 7,300.54/73.08
  6. Step 6: Final answer
    x = 99.90

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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.