Home / 13,987.80-20,981.88-4,127.22

Finding the Fourth Proportional to 13,987.80, 20,981.88 and 4,127.22

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Solution

The fourth proportional to 13,987.80, 20,981.88 and 4,127.22 is: 6,190.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,987.80 : 20,981.88 = 4,127.22 : x
  2. Step 2: Convert to fraction form
    13,987.80/20,981.88 = 4,127.22/x
  3. Step 3: Cross multiply
    13,987.80x = 20,981.88 × 4,127.22
  4. Step 4: Simplify right side
    13,987.80x = 86,596,834.77
  5. Step 5: Solve for x
    x = 86,596,834.77/13,987.80
  6. Step 6: Final answer
    x = 6,190.88

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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.