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Finding the Fourth Proportional to 428.89, 591.87 and 251.80

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Solution

The fourth proportional to 428.89, 591.87 and 251.80 is: 347.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    428.89 : 591.87 = 251.80 : x
  2. Step 2: Convert to fraction form
    428.89/591.87 = 251.80/x
  3. Step 3: Cross multiply
    428.89x = 591.87 × 251.80
  4. Step 4: Simplify right side
    428.89x = 149,031.61
  5. Step 5: Solve for x
    x = 149,031.61/428.89
  6. Step 6: Final answer
    x = 347.49

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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.