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Finding the Fourth Proportional to 279.48, 384.30 and 213.24

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Solution

The fourth proportional to 279.48, 384.30 and 213.24 is: 293.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    279.48 : 384.30 = 213.24 : x
  2. Step 2: Convert to fraction form
    279.48/384.30 = 213.24/x
  3. Step 3: Cross multiply
    279.48x = 384.30 × 213.24
  4. Step 4: Simplify right side
    279.48x = 81,948.13
  5. Step 5: Solve for x
    x = 81,948.13/279.48
  6. Step 6: Final answer
    x = 293.22

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.