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Finding the Fourth Proportional to 652.50, 978.89 and 219.65

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Solution

The fourth proportional to 652.50, 978.89 and 219.65 is: 329.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    652.50 : 978.89 = 219.65 : x
  2. Step 2: Convert to fraction form
    652.50/978.89 = 219.65/x
  3. Step 3: Cross multiply
    652.50x = 978.89 × 219.65
  4. Step 4: Simplify right side
    652.50x = 215,007.20
  5. Step 5: Solve for x
    x = 215,007.20/652.50
  6. Step 6: Final answer
    x = 329.51

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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.