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Finding the Fourth Proportional to 896.57, 1,236.20 and 657.21

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Solution

The fourth proportional to 896.57, 1,236.20 and 657.21 is: 906.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    896.57 : 1,236.20 = 657.21 : x
  2. Step 2: Convert to fraction form
    896.57/1,236.20 = 657.21/x
  3. Step 3: Cross multiply
    896.57x = 1,236.20 × 657.21
  4. Step 4: Simplify right side
    896.57x = 812,439.72
  5. Step 5: Solve for x
    x = 812,439.72/896.57
  6. Step 6: Final answer
    x = 906.17

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Double scale
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.