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Finding the Fourth Proportional to 18,811.94, 28,162.52 and 13,903.46

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Solution

The fourth proportional to 18,811.94, 28,162.52 and 13,903.46 is: 20,814.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,811.94 : 28,162.52 = 13,903.46 : x
  2. Step 2: Convert to fraction form
    18,811.94/28,162.52 = 13,903.46/x
  3. Step 3: Cross multiply
    18,811.94x = 28,162.52 × 13,903.46
  4. Step 4: Simplify right side
    18,811.94x = 391,556,470.32
  5. Step 5: Solve for x
    x = 391,556,470.32/18,811.94
  6. Step 6: Final answer
    x = 20,814.25

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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.