Home / 13,991.30-20,987.13-4,130.72

Finding the Fourth Proportional to 13,991.30, 20,987.13 and 4,130.72

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Solution

The fourth proportional to 13,991.30, 20,987.13 and 4,130.72 is: 6,196.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,991.30 : 20,987.13 = 4,130.72 : x
  2. Step 2: Convert to fraction form
    13,991.30/20,987.13 = 4,130.72/x
  3. Step 3: Cross multiply
    13,991.30x = 20,987.13 × 4,130.72
  4. Step 4: Simplify right side
    13,991.30x = 86,691,957.63
  5. Step 5: Solve for x
    x = 86,691,957.63/13,991.30
  6. Step 6: Final answer
    x = 6,196.13

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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.