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Finding the Fourth Proportional to 259.78, 389.62 and 97.47

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Solution

The fourth proportional to 259.78, 389.62 and 97.47 is: 146.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    259.78 : 389.62 = 97.47 : x
  2. Step 2: Convert to fraction form
    259.78/389.62 = 97.47/x
  3. Step 3: Cross multiply
    259.78x = 389.62 × 97.47
  4. Step 4: Simplify right side
    259.78x = 37,976.26
  5. Step 5: Solve for x
    x = 37,976.26/259.78
  6. Step 6: Final answer
    x = 146.19

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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.