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Finding the Fourth Proportional to 206.74, 310.10 and 85.00

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Solution

The fourth proportional to 206.74, 310.10 and 85.00 is: 127.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    206.74 : 310.10 = 85.00 : x
  2. Step 2: Convert to fraction form
    206.74/310.10 = 85.00/x
  3. Step 3: Cross multiply
    206.74x = 310.10 × 85.00
  4. Step 4: Simplify right side
    206.74x = 26,357.30
  5. Step 5: Solve for x
    x = 26,357.30/206.74
  6. Step 6: Final answer
    x = 127.49

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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.