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Finding the Fourth Proportional to 389.90, 584.82 and 115.98

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Solution

The fourth proportional to 389.90, 584.82 and 115.98 is: 173.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    389.90 : 584.82 = 115.98 : x
  2. Step 2: Convert to fraction form
    389.90/584.82 = 115.98/x
  3. Step 3: Cross multiply
    389.90x = 584.82 × 115.98
  4. Step 4: Simplify right side
    389.90x = 67,827.42
  5. Step 5: Solve for x
    x = 67,827.42/389.90
  6. Step 6: Final answer
    x = 173.96

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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.