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Finding the Fourth Proportional to 316.47, 436.59 and 198.39

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Solution

The fourth proportional to 316.47, 436.59 and 198.39 is: 273.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    316.47 : 436.59 = 198.39 : x
  2. Step 2: Convert to fraction form
    316.47/436.59 = 198.39/x
  3. Step 3: Cross multiply
    316.47x = 436.59 × 198.39
  4. Step 4: Simplify right side
    316.47x = 86,615.09
  5. Step 5: Solve for x
    x = 86,615.09/316.47
  6. Step 6: Final answer
    x = 273.69

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.