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Finding the Fourth Proportional to 106.90, 147.21 and 80.98

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Solution

The fourth proportional to 106.90, 147.21 and 80.98 is: 111.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    106.90 : 147.21 = 80.98 : x
  2. Step 2: Convert to fraction form
    106.90/147.21 = 80.98/x
  3. Step 3: Cross multiply
    106.90x = 147.21 × 80.98
  4. Step 4: Simplify right side
    106.90x = 11,921.07
  5. Step 5: Solve for x
    x = 11,921.07/106.90
  6. Step 6: Final answer
    x = 111.52

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.