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Finding the Fourth Proportional to 578.90, 798.77 and 330.12

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Solution

The fourth proportional to 578.90, 798.77 and 330.12 is: 455.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    578.90 : 798.77 = 330.12 : x
  2. Step 2: Convert to fraction form
    578.90/798.77 = 330.12/x
  3. Step 3: Cross multiply
    578.90x = 798.77 × 330.12
  4. Step 4: Simplify right side
    578.90x = 263,690.78
  5. Step 5: Solve for x
    x = 263,690.78/578.90
  6. Step 6: Final answer
    x = 455.50

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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.