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Finding the Fourth Proportional to 106.78, 147.54 and 100.84

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Solution

The fourth proportional to 106.78, 147.54 and 100.84 is: 139.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    106.78 : 147.54 = 100.84 : x
  2. Step 2: Convert to fraction form
    106.78/147.54 = 100.84/x
  3. Step 3: Cross multiply
    106.78x = 147.54 × 100.84
  4. Step 4: Simplify right side
    106.78x = 14,877.93
  5. Step 5: Solve for x
    x = 14,877.93/106.78
  6. Step 6: Final answer
    x = 139.33

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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.