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Finding the Fourth Proportional to 137.16, 205.47 and 90.86

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Solution

The fourth proportional to 137.16, 205.47 and 90.86 is: 136.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    137.16 : 205.47 = 90.86 : x
  2. Step 2: Convert to fraction form
    137.16/205.47 = 90.86/x
  3. Step 3: Cross multiply
    137.16x = 205.47 × 90.86
  4. Step 4: Simplify right side
    137.16x = 18,667.98
  5. Step 5: Solve for x
    x = 18,667.98/137.16
  6. Step 6: Final answer
    x = 136.10

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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.