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Finding the Fourth Proportional to 118.13, 162.88 and 90.11

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Solution

The fourth proportional to 118.13, 162.88 and 90.11 is: 124.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    118.13 : 162.88 = 90.11 : x
  2. Step 2: Convert to fraction form
    118.13/162.88 = 90.11/x
  3. Step 3: Cross multiply
    118.13x = 162.88 × 90.11
  4. Step 4: Simplify right side
    118.13x = 14,677.30
  5. Step 5: Solve for x
    x = 14,677.30/118.13
  6. Step 6: Final answer
    x = 124.25

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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.