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Finding the Fourth Proportional to 1,515.32, 2,090.87 and 843.05

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Solution

The fourth proportional to 1,515.32, 2,090.87 and 843.05 is: 1,163.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,515.32 : 2,090.87 = 843.05 : x
  2. Step 2: Convert to fraction form
    1,515.32/2,090.87 = 843.05/x
  3. Step 3: Cross multiply
    1,515.32x = 2,090.87 × 843.05
  4. Step 4: Simplify right side
    1,515.32x = 1,762,693.28
  5. Step 5: Solve for x
    x = 1,762,693.28/1,515.32
  6. Step 6: Final answer
    x = 1,163.25

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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.