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Finding the Fourth Proportional to 896.81, 1,236.78 and 564.71

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Solution

The fourth proportional to 896.81, 1,236.78 and 564.71 is: 778.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    896.81 : 1,236.78 = 564.71 : x
  2. Step 2: Convert to fraction form
    896.81/1,236.78 = 564.71/x
  3. Step 3: Cross multiply
    896.81x = 1,236.78 × 564.71
  4. Step 4: Simplify right side
    896.81x = 698,415.85
  5. Step 5: Solve for x
    x = 698,415.85/896.81
  6. Step 6: Final answer
    x = 778.78

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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.