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Finding the Fourth Proportional to 259.78, 389.78 and 136.46

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Solution

The fourth proportional to 259.78, 389.78 and 136.46 is: 204.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    259.78 : 389.78 = 136.46 : x
  2. Step 2: Convert to fraction form
    259.78/389.78 = 136.46/x
  3. Step 3: Cross multiply
    259.78x = 389.78 × 136.46
  4. Step 4: Simplify right side
    259.78x = 53,189.38
  5. Step 5: Solve for x
    x = 53,189.38/259.78
  6. Step 6: Final answer
    x = 204.75

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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.