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Finding the Fourth Proportional to 117.54, 162.12 and 80.71

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Solution

The fourth proportional to 117.54, 162.12 and 80.71 is: 111.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    117.54 : 162.12 = 80.71 : x
  2. Step 2: Convert to fraction form
    117.54/162.12 = 80.71/x
  3. Step 3: Cross multiply
    117.54x = 162.12 × 80.71
  4. Step 4: Simplify right side
    117.54x = 13,084.71
  5. Step 5: Solve for x
    x = 13,084.71/117.54
  6. Step 6: Final answer
    x = 111.32

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.