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Finding the Fourth Proportional to 289.94, 400.28 and 197.18

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Solution

The fourth proportional to 289.94, 400.28 and 197.18 is: 272.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    289.94 : 400.28 = 197.18 : x
  2. Step 2: Convert to fraction form
    289.94/400.28 = 197.18/x
  3. Step 3: Cross multiply
    289.94x = 400.28 × 197.18
  4. Step 4: Simplify right side
    289.94x = 78,927.21
  5. Step 5: Solve for x
    x = 78,927.21/289.94
  6. Step 6: Final answer
    x = 272.22

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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.