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Finding the Fourth Proportional to 206.45, 284.78 and 131.72

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Solution

The fourth proportional to 206.45, 284.78 and 131.72 is: 181.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    206.45 : 284.78 = 131.72 : x
  2. Step 2: Convert to fraction form
    206.45/284.78 = 131.72/x
  3. Step 3: Cross multiply
    206.45x = 284.78 × 131.72
  4. Step 4: Simplify right side
    206.45x = 37,510.93
  5. Step 5: Solve for x
    x = 37,510.93/206.45
  6. Step 6: Final answer
    x = 181.70

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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.