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Finding the Fourth Proportional to 896.20, 1,345.96 and 857.96

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Solution

The fourth proportional to 896.20, 1,345.96 and 857.96 is: 1,288.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    896.20 : 1,345.96 = 857.96 : x
  2. Step 2: Convert to fraction form
    896.20/1,345.96 = 857.96/x
  3. Step 3: Cross multiply
    896.20x = 1,345.96 × 857.96
  4. Step 4: Simplify right side
    896.20x = 1,154,779.84
  5. Step 5: Solve for x
    x = 1,154,779.84/896.20
  6. Step 6: Final answer
    x = 1,288.53

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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.