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Finding the Fourth Proportional to 149.15, 205.86 and 100.08

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Solution

The fourth proportional to 149.15, 205.86 and 100.08 is: 138.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    149.15 : 205.86 = 100.08 : x
  2. Step 2: Convert to fraction form
    149.15/205.86 = 100.08/x
  3. Step 3: Cross multiply
    149.15x = 205.86 × 100.08
  4. Step 4: Simplify right side
    149.15x = 20,602.47
  5. Step 5: Solve for x
    x = 20,602.47/149.15
  6. Step 6: Final answer
    x = 138.13

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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.