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Finding the Fourth Proportional to 289.68, 400.11 and 210.87

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Solution

The fourth proportional to 289.68, 400.11 and 210.87 is: 291.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    289.68 : 400.11 = 210.87 : x
  2. Step 2: Convert to fraction form
    289.68/400.11 = 210.87/x
  3. Step 3: Cross multiply
    289.68x = 400.11 × 210.87
  4. Step 4: Simplify right side
    289.68x = 84,371.56
  5. Step 5: Solve for x
    x = 84,371.56/289.68
  6. Step 6: Final answer
    x = 291.26

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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.