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Finding the Fourth Proportional to 109.17, 162.84 and 100.05

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Solution

The fourth proportional to 109.17, 162.84 and 100.05 is: 149.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    109.17 : 162.84 = 100.05 : x
  2. Step 2: Convert to fraction form
    109.17/162.84 = 100.05/x
  3. Step 3: Cross multiply
    109.17x = 162.84 × 100.05
  4. Step 4: Simplify right side
    109.17x = 16,292.14
  5. Step 5: Solve for x
    x = 16,292.14/109.17
  6. Step 6: Final answer
    x = 149.24

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.