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Finding the Fourth Proportional to 208.10, 311.88 and 99.74

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Solution

The fourth proportional to 208.10, 311.88 and 99.74 is: 149.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    208.10 : 311.88 = 99.74 : x
  2. Step 2: Convert to fraction form
    208.10/311.88 = 99.74/x
  3. Step 3: Cross multiply
    208.10x = 311.88 × 99.74
  4. Step 4: Simplify right side
    208.10x = 31,106.91
  5. Step 5: Solve for x
    x = 31,106.91/208.10
  6. Step 6: Final answer
    x = 149.48

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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.