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Finding the Fourth Proportional to 325.70, 486.15 and 280.34

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Solution

The fourth proportional to 325.70, 486.15 and 280.34 is: 418.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    325.70 : 486.15 = 280.34 : x
  2. Step 2: Convert to fraction form
    325.70/486.15 = 280.34/x
  3. Step 3: Cross multiply
    325.70x = 486.15 × 280.34
  4. Step 4: Simplify right side
    325.70x = 136,287.29
  5. Step 5: Solve for x
    x = 136,287.29/325.70
  6. Step 6: Final answer
    x = 418.44

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.