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Finding the Fourth Proportional to 106.61, 160.20 and 66.20

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Solution

The fourth proportional to 106.61, 160.20 and 66.20 is: 99.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    106.61 : 160.20 = 66.20 : x
  2. Step 2: Convert to fraction form
    106.61/160.20 = 66.20/x
  3. Step 3: Cross multiply
    106.61x = 160.20 × 66.20
  4. Step 4: Simplify right side
    106.61x = 10,604.44
  5. Step 5: Solve for x
    x = 10,604.44/106.61
  6. Step 6: Final answer
    x = 99.47

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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.