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Finding the Fourth Proportional to 652.54, 978.87 and 213.62

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Solution

The fourth proportional to 652.54, 978.87 and 213.62 is: 320.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    652.54 : 978.87 = 213.62 : x
  2. Step 2: Convert to fraction form
    652.54/978.87 = 213.62/x
  3. Step 3: Cross multiply
    652.54x = 978.87 × 213.62
  4. Step 4: Simplify right side
    652.54x = 209,105.14
  5. Step 5: Solve for x
    x = 209,105.14/652.54
  6. Step 6: Final answer
    x = 320.45

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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.