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Finding the Fourth Proportional to 259.46, 388.95 and 129.38

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Solution

The fourth proportional to 259.46, 388.95 and 129.38 is: 193.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    259.46 : 388.95 = 129.38 : x
  2. Step 2: Convert to fraction form
    259.46/388.95 = 129.38/x
  3. Step 3: Cross multiply
    259.46x = 388.95 × 129.38
  4. Step 4: Simplify right side
    259.46x = 50,322.35
  5. Step 5: Solve for x
    x = 50,322.35/259.46
  6. Step 6: Final answer
    x = 193.95

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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.