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Finding the Fourth Proportional to 314.95, 434.79 and 196.99

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Solution

The fourth proportional to 314.95, 434.79 and 196.99 is: 271.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    314.95 : 434.79 = 196.99 : x
  2. Step 2: Convert to fraction form
    314.95/434.79 = 196.99/x
  3. Step 3: Cross multiply
    314.95x = 434.79 × 196.99
  4. Step 4: Simplify right side
    314.95x = 85,651.81
  5. Step 5: Solve for x
    x = 85,651.81/314.95
  6. Step 6: Final answer
    x = 271.95

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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.