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Finding the Fourth Proportional to 371, 511.97 and 211.51

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Solution

The fourth proportional to 371, 511.97 and 211.51 is: 291.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    371 : 511.97 = 211.51 : x
  2. Step 2: Convert to fraction form
    371/511.97 = 211.51/x
  3. Step 3: Cross multiply
    371x = 511.97 × 211.51
  4. Step 4: Simplify right side
    371x = 108,288.69
  5. Step 5: Solve for x
    x = 108,288.69/371
  6. Step 6: Final answer
    x = 291.88

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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.