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Finding the Fourth Proportional to 356.07, 491.38 and 198.71

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Solution

The fourth proportional to 356.07, 491.38 and 198.71 is: 274.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    356.07 : 491.38 = 198.71 : x
  2. Step 2: Convert to fraction form
    356.07/491.38 = 198.71/x
  3. Step 3: Cross multiply
    356.07x = 491.38 × 198.71
  4. Step 4: Simplify right side
    356.07x = 97,642.12
  5. Step 5: Solve for x
    x = 97,642.12/356.07
  6. Step 6: Final answer
    x = 274.22

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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.