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Finding the Fourth Proportional to 1,992.58, 2,991.60 and 1,265.40

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Solution

The fourth proportional to 1,992.58, 2,991.60 and 1,265.40 is: 1,899.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,992.58 : 2,991.60 = 1,265.40 : x
  2. Step 2: Convert to fraction form
    1,992.58/2,991.60 = 1,265.40/x
  3. Step 3: Cross multiply
    1,992.58x = 2,991.60 × 1,265.40
  4. Step 4: Simplify right side
    1,992.58x = 3,785,570.64
  5. Step 5: Solve for x
    x = 3,785,570.64/1,992.58
  6. Step 6: Final answer
    x = 1,899.84

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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.