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Finding the Fourth Proportional to 258.98, 388.74 and 207.94

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Solution

The fourth proportional to 258.98, 388.74 and 207.94 is: 312.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    258.98 : 388.74 = 207.94 : x
  2. Step 2: Convert to fraction form
    258.98/388.74 = 207.94/x
  3. Step 3: Cross multiply
    258.98x = 388.74 × 207.94
  4. Step 4: Simplify right side
    258.98x = 80,834.60
  5. Step 5: Solve for x
    x = 80,834.60/258.98
  6. Step 6: Final answer
    x = 312.13

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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.