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Finding the Fourth Proportional to 652.64, 978.92 and 219.80

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Solution

The fourth proportional to 652.64, 978.92 and 219.80 is: 329.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    652.64 : 978.92 = 219.80 : x
  2. Step 2: Convert to fraction form
    652.64/978.92 = 219.80/x
  3. Step 3: Cross multiply
    652.64x = 978.92 × 219.80
  4. Step 4: Simplify right side
    652.64x = 215,166.62
  5. Step 5: Solve for x
    x = 215,166.62/652.64
  6. Step 6: Final answer
    x = 329.69

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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.