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Finding the Fourth Proportional to 578.20, 798.58 and 388.82

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Solution

The fourth proportional to 578.20, 798.58 and 388.82 is: 537.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    578.20 : 798.58 = 388.82 : x
  2. Step 2: Convert to fraction form
    578.20/798.58 = 388.82/x
  3. Step 3: Cross multiply
    578.20x = 798.58 × 388.82
  4. Step 4: Simplify right side
    578.20x = 310,501.92
  5. Step 5: Solve for x
    x = 310,501.92/578.20
  6. Step 6: Final answer
    x = 537.01

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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.