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Finding the Fourth Proportional to 137.93, 206.70 and 86.54

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Solution

The fourth proportional to 137.93, 206.70 and 86.54 is: 129.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    137.93 : 206.70 = 86.54 : x
  2. Step 2: Convert to fraction form
    137.93/206.70 = 86.54/x
  3. Step 3: Cross multiply
    137.93x = 206.70 × 86.54
  4. Step 4: Simplify right side
    137.93x = 17,887.63
  5. Step 5: Solve for x
    x = 17,887.63/137.93
  6. Step 6: Final answer
    x = 129.69

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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.