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Finding the Fourth Proportional to 1,991.03, 2,985.36 and 879.89

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Solution

The fourth proportional to 1,991.03, 2,985.36 and 879.89 is: 1,319.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,991.03 : 2,985.36 = 879.89 : x
  2. Step 2: Convert to fraction form
    1,991.03/2,985.36 = 879.89/x
  3. Step 3: Cross multiply
    1,991.03x = 2,985.36 × 879.89
  4. Step 4: Simplify right side
    1,991.03x = 2,626,778.58
  5. Step 5: Solve for x
    x = 2,626,778.58/1,991.03
  6. Step 6: Final answer
    x = 1,319.31

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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.