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Finding the Fourth Proportional to 486.90, 730.16 and 213

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Solution

The fourth proportional to 486.90, 730.16 and 213 is: 319.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    486.90 : 730.16 = 213 : x
  2. Step 2: Convert to fraction form
    486.90/730.16 = 213/x
  3. Step 3: Cross multiply
    486.90x = 730.16 × 213
  4. Step 4: Simplify right side
    486.90x = 155,524.08
  5. Step 5: Solve for x
    x = 155,524.08/486.90
  6. Step 6: Final answer
    x = 319.42

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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.