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Finding the Fourth Proportional to 285.57, 427.64 and 198.69

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Solution

The fourth proportional to 285.57, 427.64 and 198.69 is: 297.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    285.57 : 427.64 = 198.69 : x
  2. Step 2: Convert to fraction form
    285.57/427.64 = 198.69/x
  3. Step 3: Cross multiply
    285.57x = 427.64 × 198.69
  4. Step 4: Simplify right side
    285.57x = 84,966.80
  5. Step 5: Solve for x
    x = 84,966.80/285.57
  6. Step 6: Final answer
    x = 297.53

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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.