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Finding the Fourth Proportional to 428.82, 642.30 and 364.14

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Solution

The fourth proportional to 428.82, 642.30 and 364.14 is: 545.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    428.82 : 642.30 = 364.14 : x
  2. Step 2: Convert to fraction form
    428.82/642.30 = 364.14/x
  3. Step 3: Cross multiply
    428.82x = 642.30 × 364.14
  4. Step 4: Simplify right side
    428.82x = 233,887.12
  5. Step 5: Solve for x
    x = 233,887.12/428.82
  6. Step 6: Final answer
    x = 545.42

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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.