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Finding the Fourth Proportional to 106.20, 145.56 and 104.76

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Solution

The fourth proportional to 106.20, 145.56 and 104.76 is: 143.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    106.20 : 145.56 = 104.76 : x
  2. Step 2: Convert to fraction form
    106.20/145.56 = 104.76/x
  3. Step 3: Cross multiply
    106.20x = 145.56 × 104.76
  4. Step 4: Simplify right side
    106.20x = 15,248.87
  5. Step 5: Solve for x
    x = 15,248.87/106.20
  6. Step 6: Final answer
    x = 143.59

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.