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Finding the Fourth Proportional to 310.03, 427.40 and 221.49

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Solution

The fourth proportional to 310.03, 427.40 and 221.49 is: 305.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    310.03 : 427.40 = 221.49 : x
  2. Step 2: Convert to fraction form
    310.03/427.40 = 221.49/x
  3. Step 3: Cross multiply
    310.03x = 427.40 × 221.49
  4. Step 4: Simplify right side
    310.03x = 94,664.59
  5. Step 5: Solve for x
    x = 94,664.59/310.03
  6. Step 6: Final answer
    x = 305.34

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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.