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Finding the Fourth Proportional to 1,181.58, 1,771.48 and 815.32

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Solution

The fourth proportional to 1,181.58, 1,771.48 and 815.32 is: 1,222.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,181.58 : 1,771.48 = 815.32 : x
  2. Step 2: Convert to fraction form
    1,181.58/1,771.48 = 815.32/x
  3. Step 3: Cross multiply
    1,181.58x = 1,771.48 × 815.32
  4. Step 4: Simplify right side
    1,181.58x = 1,444,323.07
  5. Step 5: Solve for x
    x = 1,444,323.07/1,181.58
  6. Step 6: Final answer
    x = 1,222.37

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.