Home / 20,928.41-28,888.80-13,857.11

Finding the Fourth Proportional to 20,928.41, 28,888.80 and 13,857.11

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Solution

The fourth proportional to 20,928.41, 28,888.80 and 13,857.11 is: 19,127.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,928.41 : 28,888.80 = 13,857.11 : x
  2. Step 2: Convert to fraction form
    20,928.41/28,888.80 = 13,857.11/x
  3. Step 3: Cross multiply
    20,928.41x = 28,888.80 × 13,857.11
  4. Step 4: Simplify right side
    20,928.41x = 400,315,353.79
  5. Step 5: Solve for x
    x = 400,315,353.79/20,928.41
  6. Step 6: Final answer
    x = 19,127.84

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.