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Finding the Fourth Proportional to 206.74, 310.16 and 91.25

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Solution

The fourth proportional to 206.74, 310.16 and 91.25 is: 136.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    206.74 : 310.16 = 91.25 : x
  2. Step 2: Convert to fraction form
    206.74/310.16 = 91.25/x
  3. Step 3: Cross multiply
    206.74x = 310.16 × 91.25
  4. Step 4: Simplify right side
    206.74x = 28,302.10
  5. Step 5: Solve for x
    x = 28,302.10/206.74
  6. Step 6: Final answer
    x = 136.90

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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.