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Finding the Fourth Proportional to 1,316.86, 1,815.62 and 843.98

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Solution

The fourth proportional to 1,316.86, 1,815.62 and 843.98 is: 1,163.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,316.86 : 1,815.62 = 843.98 : x
  2. Step 2: Convert to fraction form
    1,316.86/1,815.62 = 843.98/x
  3. Step 3: Cross multiply
    1,316.86x = 1,815.62 × 843.98
  4. Step 4: Simplify right side
    1,316.86x = 1,532,333.67
  5. Step 5: Solve for x
    x = 1,532,333.67/1,316.86
  6. Step 6: Final answer
    x = 1,163.63

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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.