Home / 13,990.01-20,987.89-4,128.35

Finding the Fourth Proportional to 13,990.01, 20,987.89 and 4,128.35

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Solution

The fourth proportional to 13,990.01, 20,987.89 and 4,128.35 is: 6,193.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,990.01 : 20,987.89 = 4,128.35 : x
  2. Step 2: Convert to fraction form
    13,990.01/20,987.89 = 4,128.35/x
  3. Step 3: Cross multiply
    13,990.01x = 20,987.89 × 4,128.35
  4. Step 4: Simplify right side
    13,990.01x = 86,645,240.42
  5. Step 5: Solve for x
    x = 86,645,240.42/13,990.01
  6. Step 6: Final answer
    x = 6,193.37

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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.