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Finding the Fourth Proportional to 652.51, 978.79 and 219.67

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Solution

The fourth proportional to 652.51, 978.79 and 219.67 is: 329.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    652.51 : 978.79 = 219.67 : x
  2. Step 2: Convert to fraction form
    652.51/978.79 = 219.67/x
  3. Step 3: Cross multiply
    652.51x = 978.79 × 219.67
  4. Step 4: Simplify right side
    652.51x = 215,009.70
  5. Step 5: Solve for x
    x = 215,009.70/652.51
  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.