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Finding the Fourth Proportional to 2,090.61, 3,135.31 and 857.39

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Solution

The fourth proportional to 2,090.61, 3,135.31 and 857.39 is: 1,285.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,090.61 : 3,135.31 = 857.39 : x
  2. Step 2: Convert to fraction form
    2,090.61/3,135.31 = 857.39/x
  3. Step 3: Cross multiply
    2,090.61x = 3,135.31 × 857.39
  4. Step 4: Simplify right side
    2,090.61x = 2,688,165.62
  5. Step 5: Solve for x
    x = 2,688,165.62/2,090.61
  6. Step 6: Final answer
    x = 1,285.83

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1.5x scale

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.