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Finding the Fourth Proportional to 206.88, 310.40 and 98.66

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Solution

The fourth proportional to 206.88, 310.40 and 98.66 is: 148.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    206.88 : 310.40 = 98.66 : x
  2. Step 2: Convert to fraction form
    206.88/310.40 = 98.66/x
  3. Step 3: Cross multiply
    206.88x = 310.40 × 98.66
  4. Step 4: Simplify right side
    206.88x = 30,624.06
  5. Step 5: Solve for x
    x = 30,624.06/206.88
  6. Step 6: Final answer
    x = 148.03

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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.