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Finding the Fourth Proportional to 652.28, 978.41 and 219.74

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Solution

The fourth proportional to 652.28, 978.41 and 219.74 is: 329.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    652.28 : 978.41 = 219.74 : x
  2. Step 2: Convert to fraction form
    652.28/978.41 = 219.74/x
  3. Step 3: Cross multiply
    652.28x = 978.41 × 219.74
  4. Step 4: Simplify right side
    652.28x = 214,991.47
  5. Step 5: Solve for x
    x = 214,991.47/652.28
  6. Step 6: Final answer
    x = 329.60

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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.