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Finding the Fourth Proportional to 896.55, 1,345.23 and 485.61

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Solution

The fourth proportional to 896.55, 1,345.23 and 485.61 is: 728.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    896.55 : 1,345.23 = 485.61 : x
  2. Step 2: Convert to fraction form
    896.55/1,345.23 = 485.61/x
  3. Step 3: Cross multiply
    896.55x = 1,345.23 × 485.61
  4. Step 4: Simplify right side
    896.55x = 653,257.14
  5. Step 5: Solve for x
    x = 653,257.14/896.55
  6. Step 6: Final answer
    x = 728.63

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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.