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Finding the Fourth Proportional to 259.44, 389.28 and 211.68

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Solution

The fourth proportional to 259.44, 389.28 and 211.68 is: 317.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    259.44 : 389.28 = 211.68 : x
  2. Step 2: Convert to fraction form
    259.44/389.28 = 211.68/x
  3. Step 3: Cross multiply
    259.44x = 389.28 × 211.68
  4. Step 4: Simplify right side
    259.44x = 82,402.79
  5. Step 5: Solve for x
    x = 82,402.79/259.44
  6. Step 6: Final answer
    x = 317.62

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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.