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Finding the Fourth Proportional to 106.86, 147.39 and 103.86

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Solution

The fourth proportional to 106.86, 147.39 and 103.86 is: 143.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    106.86 : 147.39 = 103.86 : x
  2. Step 2: Convert to fraction form
    106.86/147.39 = 103.86/x
  3. Step 3: Cross multiply
    106.86x = 147.39 × 103.86
  4. Step 4: Simplify right side
    106.86x = 15,307.93
  5. Step 5: Solve for x
    x = 15,307.93/106.86
  6. Step 6: Final answer
    x = 143.25

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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.