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Finding the Fourth Proportional to 289.84, 399.45 and 206.95

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Solution

The fourth proportional to 289.84, 399.45 and 206.95 is: 285.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    289.84 : 399.45 = 206.95 : x
  2. Step 2: Convert to fraction form
    289.84/399.45 = 206.95/x
  3. Step 3: Cross multiply
    289.84x = 399.45 × 206.95
  4. Step 4: Simplify right side
    289.84x = 82,666.18
  5. Step 5: Solve for x
    x = 82,666.18/289.84
  6. Step 6: Final answer
    x = 285.21

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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.