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Finding the Fourth Proportional to 206.40, 284.72 and 140.79

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Solution

The fourth proportional to 206.40, 284.72 and 140.79 is: 194.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    206.40 : 284.72 = 140.79 : x
  2. Step 2: Convert to fraction form
    206.40/284.72 = 140.79/x
  3. Step 3: Cross multiply
    206.40x = 284.72 × 140.79
  4. Step 4: Simplify right side
    206.40x = 40,085.02
  5. Step 5: Solve for x
    x = 40,085.02/206.40
  6. Step 6: Final answer
    x = 194.21

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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.