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Finding the Fourth Proportional to 356.40, 491.80 and 199.03

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Solution

The fourth proportional to 356.40, 491.80 and 199.03 is: 274.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    356.40 : 491.80 = 199.03 : x
  2. Step 2: Convert to fraction form
    356.40/491.80 = 199.03/x
  3. Step 3: Cross multiply
    356.40x = 491.80 × 199.03
  4. Step 4: Simplify right side
    356.40x = 97,882.95
  5. Step 5: Solve for x
    x = 97,882.95/356.40
  6. Step 6: Final answer
    x = 274.64

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