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Finding the Fourth Proportional to 310.14, 427.90 and 221.64

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Solution

The fourth proportional to 310.14, 427.90 and 221.64 is: 305.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    310.14 : 427.90 = 221.64 : x
  2. Step 2: Convert to fraction form
    310.14/427.90 = 221.64/x
  3. Step 3: Cross multiply
    310.14x = 427.90 × 221.64
  4. Step 4: Simplify right side
    310.14x = 94,840.81
  5. Step 5: Solve for x
    x = 94,840.81/310.14
  6. Step 6: Final answer
    x = 305.80

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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.