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Finding the Fourth Proportional to 137.15, 205.55 and 64.86

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Solution

The fourth proportional to 137.15, 205.55 and 64.86 is: 97.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    137.15 : 205.55 = 64.86 : x
  2. Step 2: Convert to fraction form
    137.15/205.55 = 64.86/x
  3. Step 3: Cross multiply
    137.15x = 205.55 × 64.86
  4. Step 4: Simplify right side
    137.15x = 13,331.97
  5. Step 5: Solve for x
    x = 13,331.97/137.15
  6. Step 6: Final answer
    x = 97.21

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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.