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Finding the Fourth Proportional to 206.17, 284.51 and 112.91

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Solution

The fourth proportional to 206.17, 284.51 and 112.91 is: 155.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    206.17 : 284.51 = 112.91 : x
  2. Step 2: Convert to fraction form
    206.17/284.51 = 112.91/x
  3. Step 3: Cross multiply
    206.17x = 284.51 × 112.91
  4. Step 4: Simplify right side
    206.17x = 32,122.81
  5. Step 5: Solve for x
    x = 32,122.81/206.17
  6. Step 6: Final answer
    x = 155.81

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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.