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Finding the Fourth Proportional to 137.35, 205.89 and 56.15

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Solution

The fourth proportional to 137.35, 205.89 and 56.15 is: 84.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    137.35 : 205.89 = 56.15 : x
  2. Step 2: Convert to fraction form
    137.35/205.89 = 56.15/x
  3. Step 3: Cross multiply
    137.35x = 205.89 × 56.15
  4. Step 4: Simplify right side
    137.35x = 11,560.72
  5. Step 5: Solve for x
    x = 11,560.72/137.35
  6. Step 6: Final answer
    x = 84.17

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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.