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Finding the Fourth Proportional to 310.24, 427.51 and 221.56

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Solution

The fourth proportional to 310.24, 427.51 and 221.56 is: 305.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    310.24 : 427.51 = 221.56 : x
  2. Step 2: Convert to fraction form
    310.24/427.51 = 221.56/x
  3. Step 3: Cross multiply
    310.24x = 427.51 × 221.56
  4. Step 4: Simplify right side
    310.24x = 94,719.12
  5. Step 5: Solve for x
    x = 94,719.12/310.24
  6. Step 6: Final answer
    x = 305.31

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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.