Home / 13,986.90-20,980.63-5,220.07

Finding the Fourth Proportional to 13,986.90, 20,980.63 and 5,220.07

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Solution

The fourth proportional to 13,986.90, 20,980.63 and 5,220.07 is: 7,830.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,986.90 : 20,980.63 = 5,220.07 : x
  2. Step 2: Convert to fraction form
    13,986.90/20,980.63 = 5,220.07/x
  3. Step 3: Cross multiply
    13,986.90x = 20,980.63 × 5,220.07
  4. Step 4: Simplify right side
    13,986.90x = 109,520,357.24
  5. Step 5: Solve for x
    x = 109,520,357.24/13,986.90
  6. Step 6: Final answer
    x = 7,830.21

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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.