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Finding the Fourth Proportional to 896.66, 1,345.25 and 280.43

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Solution

The fourth proportional to 896.66, 1,345.25 and 280.43 is: 420.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    896.66 : 1,345.25 = 280.43 : x
  2. Step 2: Convert to fraction form
    896.66/1,345.25 = 280.43/x
  3. Step 3: Cross multiply
    896.66x = 1,345.25 × 280.43
  4. Step 4: Simplify right side
    896.66x = 377,241.73
  5. Step 5: Solve for x
    x = 377,241.73/896.66
  6. Step 6: Final answer
    x = 420.72

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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.