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Finding the Fourth Proportional to 652.21, 978.38 and 219.43

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Solution

The fourth proportional to 652.21, 978.38 and 219.43 is: 329.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    652.21 : 978.38 = 219.43 : x
  2. Step 2: Convert to fraction form
    652.21/978.38 = 219.43/x
  3. Step 3: Cross multiply
    652.21x = 978.38 × 219.43
  4. Step 4: Simplify right side
    652.21x = 214,685.92
  5. Step 5: Solve for x
    x = 214,685.92/652.21
  6. Step 6: Final answer
    x = 329.17

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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.