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Finding the Fourth Proportional to 289.49, 398.91 and 210.66

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Solution

The fourth proportional to 289.49, 398.91 and 210.66 is: 290.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    289.49 : 398.91 = 210.66 : x
  2. Step 2: Convert to fraction form
    289.49/398.91 = 210.66/x
  3. Step 3: Cross multiply
    289.49x = 398.91 × 210.66
  4. Step 4: Simplify right side
    289.49x = 84,034.38
  5. Step 5: Solve for x
    x = 84,034.38/289.49
  6. Step 6: Final answer
    x = 290.29

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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.