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Finding the Fourth Proportional to 428.78, 591.78 and 298.37

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Solution

The fourth proportional to 428.78, 591.78 and 298.37 is: 411.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    428.78 : 591.78 = 298.37 : x
  2. Step 2: Convert to fraction form
    428.78/591.78 = 298.37/x
  3. Step 3: Cross multiply
    428.78x = 591.78 × 298.37
  4. Step 4: Simplify right side
    428.78x = 176,569.40
  5. Step 5: Solve for x
    x = 176,569.40/428.78
  6. Step 6: Final answer
    x = 411.79

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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.