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Finding the Fourth Proportional to 117.03, 176.19 and 81.21

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Solution

The fourth proportional to 117.03, 176.19 and 81.21 is: 122.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    117.03 : 176.19 = 81.21 : x
  2. Step 2: Convert to fraction form
    117.03/176.19 = 81.21/x
  3. Step 3: Cross multiply
    117.03x = 176.19 × 81.21
  4. Step 4: Simplify right side
    117.03x = 14,308.39
  5. Step 5: Solve for x
    x = 14,308.39/117.03
  6. Step 6: Final answer
    x = 122.26

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.