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Finding the Fourth Proportional to 117.65, 162.28 and 80.90

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Solution

The fourth proportional to 117.65, 162.28 and 80.90 is: 111.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    117.65 : 162.28 = 80.90 : x
  2. Step 2: Convert to fraction form
    117.65/162.28 = 80.90/x
  3. Step 3: Cross multiply
    117.65x = 162.28 × 80.90
  4. Step 4: Simplify right side
    117.65x = 13,128.12
  5. Step 5: Solve for x
    x = 13,128.12/117.65
  6. Step 6: Final answer
    x = 111.58

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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.