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Finding the Fourth Proportional to 265.98, 398.06 and 211.31

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Solution

The fourth proportional to 265.98, 398.06 and 211.31 is: 316.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    265.98 : 398.06 = 211.31 : x
  2. Step 2: Convert to fraction form
    265.98/398.06 = 211.31/x
  3. Step 3: Cross multiply
    265.98x = 398.06 × 211.31
  4. Step 4: Simplify right side
    265.98x = 84,111.01
  5. Step 5: Solve for x
    x = 84,111.01/265.98
  6. Step 6: Final answer
    x = 316.23

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.