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Finding the Fourth Proportional to 106.20, 145.95 and 99.36

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Solution

The fourth proportional to 106.20, 145.95 and 99.36 is: 136.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    106.20 : 145.95 = 99.36 : x
  2. Step 2: Convert to fraction form
    106.20/145.95 = 99.36/x
  3. Step 3: Cross multiply
    106.20x = 145.95 × 99.36
  4. Step 4: Simplify right side
    106.20x = 14,502.39
  5. Step 5: Solve for x
    x = 14,502.39/106.20
  6. Step 6: Final answer
    x = 136.56

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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.