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Finding the Fourth Proportional to 13,991.86, 20,987.70 and 3,603.70

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Solution

The fourth proportional to 13,991.86, 20,987.70 and 3,603.70 is: 5,405.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,991.86 : 20,987.70 = 3,603.70 : x
  2. Step 2: Convert to fraction form
    13,991.86/20,987.70 = 3,603.70/x
  3. Step 3: Cross multiply
    13,991.86x = 20,987.70 × 3,603.70
  4. Step 4: Simplify right side
    13,991.86x = 75,633,374.49
  5. Step 5: Solve for x
    x = 75,633,374.49/13,991.86
  6. Step 6: Final answer
    x = 5,405.53

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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.