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Finding the Fourth Proportional to 310.21, 427.73 and 288.34

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Solution

The fourth proportional to 310.21, 427.73 and 288.34 is: 397.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    310.21 : 427.73 = 288.34 : x
  2. Step 2: Convert to fraction form
    310.21/427.73 = 288.34/x
  3. Step 3: Cross multiply
    310.21x = 427.73 × 288.34
  4. Step 4: Simplify right side
    310.21x = 123,331.67
  5. Step 5: Solve for x
    x = 123,331.67/310.21
  6. Step 6: Final answer
    x = 397.57

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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.