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Finding the Fourth Proportional to 389.97, 584.96 and 155.68

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Solution

The fourth proportional to 389.97, 584.96 and 155.68 is: 233.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    389.97 : 584.96 = 155.68 : x
  2. Step 2: Convert to fraction form
    389.97/584.96 = 155.68/x
  3. Step 3: Cross multiply
    389.97x = 584.96 × 155.68
  4. Step 4: Simplify right side
    389.97x = 91,066.57
  5. Step 5: Solve for x
    x = 91,066.57/389.97
  6. Step 6: Final answer
    x = 233.52

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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.