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Finding the Fourth Proportional to 857.64, 1,183.70 and 818.69

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Solution

The fourth proportional to 857.64, 1,183.70 and 818.69 is: 1,129.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    857.64 : 1,183.70 = 818.69 : x
  2. Step 2: Convert to fraction form
    857.64/1,183.70 = 818.69/x
  3. Step 3: Cross multiply
    857.64x = 1,183.70 × 818.69
  4. Step 4: Simplify right side
    857.64x = 969,083.35
  5. Step 5: Solve for x
    x = 969,083.35/857.64
  6. Step 6: Final answer
    x = 1,129.94

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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.