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Finding the Fourth Proportional to 393.30, 589.80 and 115.57

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Solution

The fourth proportional to 393.30, 589.80 and 115.57 is: 173.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    393.30 : 589.80 = 115.57 : x
  2. Step 2: Convert to fraction form
    393.30/589.80 = 115.57/x
  3. Step 3: Cross multiply
    393.30x = 589.80 × 115.57
  4. Step 4: Simplify right side
    393.30x = 68,159.66
  5. Step 5: Solve for x
    x = 68,159.66/393.30
  6. Step 6: Final answer
    x = 173.30

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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.