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Finding the Fourth Proportional to 858.40, 1,183.80 and 563.82

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Solution

The fourth proportional to 858.40, 1,183.80 and 563.82 is: 777.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    858.40 : 1,183.80 = 563.82 : x
  2. Step 2: Convert to fraction form
    858.40/1,183.80 = 563.82/x
  3. Step 3: Cross multiply
    858.40x = 1,183.80 × 563.82
  4. Step 4: Simplify right side
    858.40x = 667,450.12
  5. Step 5: Solve for x
    x = 667,450.12/858.40
  6. Step 6: Final answer
    x = 777.55

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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.