Home / 13,987.90-20,982.14-5,221.06

Finding the Fourth Proportional to 13,987.90, 20,982.14 and 5,221.06

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Solution

The fourth proportional to 13,987.90, 20,982.14 and 5,221.06 is: 7,831.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,987.90 : 20,982.14 = 5,221.06 : x
  2. Step 2: Convert to fraction form
    13,987.90/20,982.14 = 5,221.06/x
  3. Step 3: Cross multiply
    13,987.90x = 20,982.14 × 5,221.06
  4. Step 4: Simplify right side
    13,987.90x = 109,549,011.87
  5. Step 5: Solve for x
    x = 109,549,011.87/13,987.90
  6. Step 6: Final answer
    x = 7,831.70

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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.