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Finding the Fourth Proportional to 578.13, 798.06 and 391.88

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Solution

The fourth proportional to 578.13, 798.06 and 391.88 is: 540.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    578.13 : 798.06 = 391.88 : x
  2. Step 2: Convert to fraction form
    578.13/798.06 = 391.88/x
  3. Step 3: Cross multiply
    578.13x = 798.06 × 391.88
  4. Step 4: Simplify right side
    578.13x = 312,743.49
  5. Step 5: Solve for x
    x = 312,743.49/578.13
  6. Step 6: Final answer
    x = 540.95

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.