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Finding the Fourth Proportional to 285.47, 427.90 and 193.94

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Solution

The fourth proportional to 285.47, 427.90 and 193.94 is: 290.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    285.47 : 427.90 = 193.94 : x
  2. Step 2: Convert to fraction form
    285.47/427.90 = 193.94/x
  3. Step 3: Cross multiply
    285.47x = 427.90 × 193.94
  4. Step 4: Simplify right side
    285.47x = 82,986.93
  5. Step 5: Solve for x
    x = 82,986.93/285.47
  6. Step 6: Final answer
    x = 290.70

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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.