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Finding the Fourth Proportional to 259.47, 389.21 and 218.97

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Solution

The fourth proportional to 259.47, 389.21 and 218.97 is: 328.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    259.47 : 389.21 = 218.97 : x
  2. Step 2: Convert to fraction form
    259.47/389.21 = 218.97/x
  3. Step 3: Cross multiply
    259.47x = 389.21 × 218.97
  4. Step 4: Simplify right side
    259.47x = 85,224.22
  5. Step 5: Solve for x
    x = 85,224.22/259.47
  6. Step 6: Final answer
    x = 328.46

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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.