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Finding the Fourth Proportional to 258.99, 389.40 and 137.49

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Solution

The fourth proportional to 258.99, 389.40 and 137.49 is: 206.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    258.99 : 389.40 = 137.49 : x
  2. Step 2: Convert to fraction form
    258.99/389.40 = 137.49/x
  3. Step 3: Cross multiply
    258.99x = 389.40 × 137.49
  4. Step 4: Simplify right side
    258.99x = 53,538.61
  5. Step 5: Solve for x
    x = 53,538.61/258.99
  6. Step 6: Final answer
    x = 206.72

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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.