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Finding the Fourth Proportional to 428.46, 642.87 and 374.46

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Solution

The fourth proportional to 428.46, 642.87 and 374.46 is: 561.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    428.46 : 642.87 = 374.46 : x
  2. Step 2: Convert to fraction form
    428.46/642.87 = 374.46/x
  3. Step 3: Cross multiply
    428.46x = 642.87 × 374.46
  4. Step 4: Simplify right side
    428.46x = 240,729.10
  5. Step 5: Solve for x
    x = 240,729.10/428.46
  6. Step 6: Final answer
    x = 561.85

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.