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Finding the Fourth Proportional to 137.18, 205.56 and 98.91

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Solution

The fourth proportional to 137.18, 205.56 and 98.91 is: 148.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    137.18 : 205.56 = 98.91 : x
  2. Step 2: Convert to fraction form
    137.18/205.56 = 98.91/x
  3. Step 3: Cross multiply
    137.18x = 205.56 × 98.91
  4. Step 4: Simplify right side
    137.18x = 20,331.93
  5. Step 5: Solve for x
    x = 20,331.93/137.18
  6. Step 6: Final answer
    x = 148.21

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.