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Finding the Fourth Proportional to 285.71, 427.79 and 198.86

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Solution

The fourth proportional to 285.71, 427.79 and 198.86 is: 297.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    285.71 : 427.79 = 198.86 : x
  2. Step 2: Convert to fraction form
    285.71/427.79 = 198.86/x
  3. Step 3: Cross multiply
    285.71x = 427.79 × 198.86
  4. Step 4: Simplify right side
    285.71x = 85,068.68
  5. Step 5: Solve for x
    x = 85,068.68/285.71
  6. Step 6: Final answer
    x = 297.75

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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.