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Finding the Fourth Proportional to 105.21, 144.45 and 99.29

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Solution

The fourth proportional to 105.21, 144.45 and 99.29 is: 136.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    105.21 : 144.45 = 99.29 : x
  2. Step 2: Convert to fraction form
    105.21/144.45 = 99.29/x
  3. Step 3: Cross multiply
    105.21x = 144.45 × 99.29
  4. Step 4: Simplify right side
    105.21x = 14,341.72
  5. Step 5: Solve for x
    x = 14,341.72/105.21
  6. Step 6: Final answer
    x = 136.32

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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.