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Finding the Fourth Proportional to 428.58, 591.31 and 262.78

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Solution

The fourth proportional to 428.58, 591.31 and 262.78 is: 362.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    428.58 : 591.31 = 262.78 : x
  2. Step 2: Convert to fraction form
    428.58/591.31 = 262.78/x
  3. Step 3: Cross multiply
    428.58x = 591.31 × 262.78
  4. Step 4: Simplify right side
    428.58x = 155,384.44
  5. Step 5: Solve for x
    x = 155,384.44/428.58
  6. Step 6: Final answer
    x = 362.56

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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.