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Finding the Fourth Proportional to 578.85, 798.85 and 438.75

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Solution

The fourth proportional to 578.85, 798.85 and 438.75 is: 605.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    578.85 : 798.85 = 438.75 : x
  2. Step 2: Convert to fraction form
    578.85/798.85 = 438.75/x
  3. Step 3: Cross multiply
    578.85x = 798.85 × 438.75
  4. Step 4: Simplify right side
    578.85x = 350,495.44
  5. Step 5: Solve for x
    x = 350,495.44/578.85
  6. Step 6: Final answer
    x = 605.50

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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.