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Finding the Fourth Proportional to 259.75, 389.68 and 137.98

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Solution

The fourth proportional to 259.75, 389.68 and 137.98 is: 207.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    259.75 : 389.68 = 137.98 : x
  2. Step 2: Convert to fraction form
    259.75/389.68 = 137.98/x
  3. Step 3: Cross multiply
    259.75x = 389.68 × 137.98
  4. Step 4: Simplify right side
    259.75x = 53,768.05
  5. Step 5: Solve for x
    x = 53,768.05/259.75
  6. Step 6: Final answer
    x = 207.00

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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.