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Finding the Fourth Proportional to 389.26, 583.76 and 115.28

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Solution

The fourth proportional to 389.26, 583.76 and 115.28 is: 172.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    389.26 : 583.76 = 115.28 : x
  2. Step 2: Convert to fraction form
    389.26/583.76 = 115.28/x
  3. Step 3: Cross multiply
    389.26x = 583.76 × 115.28
  4. Step 4: Simplify right side
    389.26x = 67,295.85
  5. Step 5: Solve for x
    x = 67,295.85/389.26
  6. Step 6: Final answer
    x = 172.88

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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.