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Finding the Fourth Proportional to 389.70, 584.02 and 207.22

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Solution

The fourth proportional to 389.70, 584.02 and 207.22 is: 310.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    389.70 : 584.02 = 207.22 : x
  2. Step 2: Convert to fraction form
    389.70/584.02 = 207.22/x
  3. Step 3: Cross multiply
    389.70x = 584.02 × 207.22
  4. Step 4: Simplify right side
    389.70x = 121,020.62
  5. Step 5: Solve for x
    x = 121,020.62/389.70
  6. Step 6: Final answer
    x = 310.55

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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.