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Finding the Fourth Proportional to 393.32, 587.49 and 391.29

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Solution

The fourth proportional to 393.32, 587.49 and 391.29 is: 584.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    393.32 : 587.49 = 391.29 : x
  2. Step 2: Convert to fraction form
    393.32/587.49 = 391.29/x
  3. Step 3: Cross multiply
    393.32x = 587.49 × 391.29
  4. Step 4: Simplify right side
    393.32x = 229,878.96
  5. Step 5: Solve for x
    x = 229,878.96/393.32
  6. Step 6: Final answer
    x = 584.47

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.