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Finding the Fourth Proportional to 109.80, 163.83 and 100.02

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Solution

The fourth proportional to 109.80, 163.83 and 100.02 is: 149.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    109.80 : 163.83 = 100.02 : x
  2. Step 2: Convert to fraction form
    109.80/163.83 = 100.02/x
  3. Step 3: Cross multiply
    109.80x = 163.83 × 100.02
  4. Step 4: Simplify right side
    109.80x = 16,386.28
  5. Step 5: Solve for x
    x = 16,386.28/109.80
  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.