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Finding the Fourth Proportional to 389.39, 584.28 and 158.45

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Solution

The fourth proportional to 389.39, 584.28 and 158.45 is: 237.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    389.39 : 584.28 = 158.45 : x
  2. Step 2: Convert to fraction form
    389.39/584.28 = 158.45/x
  3. Step 3: Cross multiply
    389.39x = 584.28 × 158.45
  4. Step 4: Simplify right side
    389.39x = 92,576.24
  5. Step 5: Solve for x
    x = 92,576.24/389.39
  6. Step 6: Final answer
    x = 237.75

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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.