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Finding the Fourth Proportional to 259.21, 388.36 and 190.90

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Solution

The fourth proportional to 259.21, 388.36 and 190.90 is: 286.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    259.21 : 388.36 = 190.90 : x
  2. Step 2: Convert to fraction form
    259.21/388.36 = 190.90/x
  3. Step 3: Cross multiply
    259.21x = 388.36 × 190.90
  4. Step 4: Simplify right side
    259.21x = 74,137.92
  5. Step 5: Solve for x
    x = 74,137.92/259.21
  6. Step 6: Final answer
    x = 286.01

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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.