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Finding the Fourth Proportional to 428.31, 590.99 and 251.28

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Solution

The fourth proportional to 428.31, 590.99 and 251.28 is: 346.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    428.31 : 590.99 = 251.28 : x
  2. Step 2: Convert to fraction form
    428.31/590.99 = 251.28/x
  3. Step 3: Cross multiply
    428.31x = 590.99 × 251.28
  4. Step 4: Simplify right side
    428.31x = 148,503.97
  5. Step 5: Solve for x
    x = 148,503.97/428.31
  6. Step 6: Final answer
    x = 346.72

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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.