Home / 13,820.80-20,708.40-7,967.20

Finding the Fourth Proportional to 13,820.80, 20,708.40 and 7,967.20

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Solution

The fourth proportional to 13,820.80, 20,708.40 and 7,967.20 is: 11,937.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,820.80 : 20,708.40 = 7,967.20 : x
  2. Step 2: Convert to fraction form
    13,820.80/20,708.40 = 7,967.20/x
  3. Step 3: Cross multiply
    13,820.80x = 20,708.40 × 7,967.20
  4. Step 4: Simplify right side
    13,820.80x = 164,987,964.48
  5. Step 5: Solve for x
    x = 164,987,964.48/13,820.80
  6. Step 6: Final answer
    x = 11,937.66

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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.