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Finding the Fourth Proportional to 2,090.88, 3,135.80 and 858.63

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Solution

The fourth proportional to 2,090.88, 3,135.80 and 858.63 is: 1,287.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,090.88 : 3,135.80 = 858.63 : x
  2. Step 2: Convert to fraction form
    2,090.88/3,135.80 = 858.63/x
  3. Step 3: Cross multiply
    2,090.88x = 3,135.80 × 858.63
  4. Step 4: Simplify right side
    2,090.88x = 2,692,487.66
  5. Step 5: Solve for x
    x = 2,692,487.66/2,090.88
  6. Step 6: Final answer
    x = 1,287.73

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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.