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Finding the Fourth Proportional to 896.79, 1,344.36 and 665.40

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Solution

The fourth proportional to 896.79, 1,344.36 and 665.40 is: 997.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    896.79 : 1,344.36 = 665.40 : x
  2. Step 2: Convert to fraction form
    896.79/1,344.36 = 665.40/x
  3. Step 3: Cross multiply
    896.79x = 1,344.36 × 665.40
  4. Step 4: Simplify right side
    896.79x = 894,532.09
  5. Step 5: Solve for x
    x = 894,532.09/896.79
  6. Step 6: Final answer
    x = 997.49

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Double scale
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1.5x scale

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.