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Finding the Fourth Proportional to 259.66, 388.58 and 198.30

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Solution

The fourth proportional to 259.66, 388.58 and 198.30 is: 296.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    259.66 : 388.58 = 198.30 : x
  2. Step 2: Convert to fraction form
    259.66/388.58 = 198.30/x
  3. Step 3: Cross multiply
    259.66x = 388.58 × 198.30
  4. Step 4: Simplify right side
    259.66x = 77,055.41
  5. Step 5: Solve for x
    x = 77,055.41/259.66
  6. Step 6: Final answer
    x = 296.76

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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.