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Finding the Fourth Proportional to 106.80, 147.36 and 74.08

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Solution

The fourth proportional to 106.80, 147.36 and 74.08 is: 102.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    106.80 : 147.36 = 74.08 : x
  2. Step 2: Convert to fraction form
    106.80/147.36 = 74.08/x
  3. Step 3: Cross multiply
    106.80x = 147.36 × 74.08
  4. Step 4: Simplify right side
    106.80x = 10,916.43
  5. Step 5: Solve for x
    x = 10,916.43/106.80
  6. Step 6: Final answer
    x = 102.21

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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.