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Finding the Fourth Proportional to 259.69, 390.06 and 221.23

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Solution

The fourth proportional to 259.69, 390.06 and 221.23 is: 332.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    259.69 : 390.06 = 221.23 : x
  2. Step 2: Convert to fraction form
    259.69/390.06 = 221.23/x
  3. Step 3: Cross multiply
    259.69x = 390.06 × 221.23
  4. Step 4: Simplify right side
    259.69x = 86,292.97
  5. Step 5: Solve for x
    x = 86,292.97/259.69
  6. Step 6: Final answer
    x = 332.29

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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.