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Finding the Fourth Proportional to 1,991.86, 2,985.05 and 1,015.91

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Solution

The fourth proportional to 1,991.86, 2,985.05 and 1,015.91 is: 1,522.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,991.86 : 2,985.05 = 1,015.91 : x
  2. Step 2: Convert to fraction form
    1,991.86/2,985.05 = 1,015.91/x
  3. Step 3: Cross multiply
    1,991.86x = 2,985.05 × 1,015.91
  4. Step 4: Simplify right side
    1,991.86x = 3,032,540.95
  5. Step 5: Solve for x
    x = 3,032,540.95/1,991.86
  6. Step 6: Final answer
    x = 1,522.47

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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.