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Finding the Fourth Proportional to 896.89, 1,345.49 and 280.66

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Solution

The fourth proportional to 896.89, 1,345.49 and 280.66 is: 421.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    896.89 : 1,345.49 = 280.66 : x
  2. Step 2: Convert to fraction form
    896.89/1,345.49 = 280.66/x
  3. Step 3: Cross multiply
    896.89x = 1,345.49 × 280.66
  4. Step 4: Simplify right side
    896.89x = 377,620.46
  5. Step 5: Solve for x
    x = 377,620.46/896.89
  6. Step 6: Final answer
    x = 421.03

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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.