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Finding the Fourth Proportional to 452.20, 678.30 and 342.85

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Solution

The fourth proportional to 452.20, 678.30 and 342.85 is: 514.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    452.20 : 678.30 = 342.85 : x
  2. Step 2: Convert to fraction form
    452.20/678.30 = 342.85/x
  3. Step 3: Cross multiply
    452.20x = 678.30 × 342.85
  4. Step 4: Simplify right side
    452.20x = 232,555.16
  5. Step 5: Solve for x
    x = 232,555.16/452.20
  6. Step 6: Final answer
    x = 514.28

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.