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Finding the Fourth Proportional to 259.57, 389.54 and 162.21

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Solution

The fourth proportional to 259.57, 389.54 and 162.21 is: 243.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    259.57 : 389.54 = 162.21 : x
  2. Step 2: Convert to fraction form
    259.57/389.54 = 162.21/x
  3. Step 3: Cross multiply
    259.57x = 389.54 × 162.21
  4. Step 4: Simplify right side
    259.57x = 63,186.05
  5. Step 5: Solve for x
    x = 63,186.05/259.57
  6. Step 6: Final answer
    x = 243.43

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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.