Home / 13,851.09-20,772.36-3,987.72

Finding the Fourth Proportional to 13,851.09, 20,772.36 and 3,987.72

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Solution

The fourth proportional to 13,851.09, 20,772.36 and 3,987.72 is: 5,980.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,851.09 : 20,772.36 = 3,987.72 : x
  2. Step 2: Convert to fraction form
    13,851.09/20,772.36 = 3,987.72/x
  3. Step 3: Cross multiply
    13,851.09x = 20,772.36 × 3,987.72
  4. Step 4: Simplify right side
    13,851.09x = 82,834,355.42
  5. Step 5: Solve for x
    x = 82,834,355.42/13,851.09
  6. Step 6: Final answer
    x = 5,980.35

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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.