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Finding the Fourth Proportional to 206.40, 284.84 and 117.88

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Solution

The fourth proportional to 206.40, 284.84 and 117.88 is: 162.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    206.40 : 284.84 = 117.88 : x
  2. Step 2: Convert to fraction form
    206.40/284.84 = 117.88/x
  3. Step 3: Cross multiply
    206.40x = 284.84 × 117.88
  4. Step 4: Simplify right side
    206.40x = 33,576.94
  5. Step 5: Solve for x
    x = 33,576.94/206.40
  6. Step 6: Final answer
    x = 162.68

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.