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Finding the Fourth Proportional to 578.40, 798.30 and 329.70

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Solution

The fourth proportional to 578.40, 798.30 and 329.70 is: 455.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    578.40 : 798.30 = 329.70 : x
  2. Step 2: Convert to fraction form
    578.40/798.30 = 329.70/x
  3. Step 3: Cross multiply
    578.40x = 798.30 × 329.70
  4. Step 4: Simplify right side
    578.40x = 263,199.51
  5. Step 5: Solve for x
    x = 263,199.51/578.40
  6. Step 6: Final answer
    x = 455.05

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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.