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Finding the Fourth Proportional to 106.54, 147.09 and 67.78

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Solution

The fourth proportional to 106.54, 147.09 and 67.78 is: 93.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    106.54 : 147.09 = 67.78 : x
  2. Step 2: Convert to fraction form
    106.54/147.09 = 67.78/x
  3. Step 3: Cross multiply
    106.54x = 147.09 × 67.78
  4. Step 4: Simplify right side
    106.54x = 9,969.76
  5. Step 5: Solve for x
    x = 9,969.76/106.54
  6. Step 6: Final answer
    x = 93.58

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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.