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Finding the Fourth Proportional to 309.56, 427.16 and 211.47

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Solution

The fourth proportional to 309.56, 427.16 and 211.47 is: 291.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    309.56 : 427.16 = 211.47 : x
  2. Step 2: Convert to fraction form
    309.56/427.16 = 211.47/x
  3. Step 3: Cross multiply
    309.56x = 427.16 × 211.47
  4. Step 4: Simplify right side
    309.56x = 90,330.47
  5. Step 5: Solve for x
    x = 90,330.47/309.56
  6. Step 6: Final answer
    x = 291.81

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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.