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Finding the Fourth Proportional to 259.51, 389.21 and 97.21

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Solution

The fourth proportional to 259.51, 389.21 and 97.21 is: 145.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    259.51 : 389.21 = 97.21 : x
  2. Step 2: Convert to fraction form
    259.51/389.21 = 97.21/x
  3. Step 3: Cross multiply
    259.51x = 389.21 × 97.21
  4. Step 4: Simplify right side
    259.51x = 37,833.16
  5. Step 5: Solve for x
    x = 37,833.16/259.51
  6. Step 6: Final answer
    x = 145.79

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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.