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Finding the Fourth Proportional to 389.81, 584.58 and 133.25

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Solution

The fourth proportional to 389.81, 584.58 and 133.25 is: 199.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    389.81 : 584.58 = 133.25 : x
  2. Step 2: Convert to fraction form
    389.81/584.58 = 133.25/x
  3. Step 3: Cross multiply
    389.81x = 584.58 × 133.25
  4. Step 4: Simplify right side
    389.81x = 77,895.29
  5. Step 5: Solve for x
    x = 77,895.29/389.81
  6. Step 6: Final answer
    x = 199.83

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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.