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Finding the Fourth Proportional to 289.61, 400.14 and 286.73

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Solution

The fourth proportional to 289.61, 400.14 and 286.73 is: 396.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    289.61 : 400.14 = 286.73 : x
  2. Step 2: Convert to fraction form
    289.61/400.14 = 286.73/x
  3. Step 3: Cross multiply
    289.61x = 400.14 × 286.73
  4. Step 4: Simplify right side
    289.61x = 114,730.14
  5. Step 5: Solve for x
    x = 114,730.14/289.61
  6. Step 6: Final answer
    x = 396.16

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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.