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Finding the Fourth Proportional to 896.34, 1,345.11 and 485.61

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Solution

The fourth proportional to 896.34, 1,345.11 and 485.61 is: 728.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    896.34 : 1,345.11 = 485.61 : x
  2. Step 2: Convert to fraction form
    896.34/1,345.11 = 485.61/x
  3. Step 3: Cross multiply
    896.34x = 1,345.11 × 485.61
  4. Step 4: Simplify right side
    896.34x = 653,198.87
  5. Step 5: Solve for x
    x = 653,198.87/896.34
  6. Step 6: Final answer
    x = 728.74

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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.