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Finding the Fourth Proportional to 896.40, 1,238.76 and 699.57

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Solution

The fourth proportional to 896.40, 1,238.76 and 699.57 is: 966.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    896.40 : 1,238.76 = 699.57 : x
  2. Step 2: Convert to fraction form
    896.40/1,238.76 = 699.57/x
  3. Step 3: Cross multiply
    896.40x = 1,238.76 × 699.57
  4. Step 4: Simplify right side
    896.40x = 866,599.33
  5. Step 5: Solve for x
    x = 866,599.33/896.40
  6. Step 6: Final answer
    x = 966.76

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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.