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Finding the Fourth Proportional to 487.40, 730.68 and 213.29

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Solution

The fourth proportional to 487.40, 730.68 and 213.29 is: 319.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    487.40 : 730.68 = 213.29 : x
  2. Step 2: Convert to fraction form
    487.40/730.68 = 213.29/x
  3. Step 3: Cross multiply
    487.40x = 730.68 × 213.29
  4. Step 4: Simplify right side
    487.40x = 155,843.08
  5. Step 5: Solve for x
    x = 155,843.08/487.40
  6. Step 6: Final answer
    x = 319.74

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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.