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Finding the Fourth Proportional to 120.63, 167.47 and 117.28

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Solution

The fourth proportional to 120.63, 167.47 and 117.28 is: 162.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    120.63 : 167.47 = 117.28 : x
  2. Step 2: Convert to fraction form
    120.63/167.47 = 117.28/x
  3. Step 3: Cross multiply
    120.63x = 167.47 × 117.28
  4. Step 4: Simplify right side
    120.63x = 19,640.88
  5. Step 5: Solve for x
    x = 19,640.88/120.63
  6. Step 6: Final answer
    x = 162.82

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.