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Finding the Fourth Proportional to 18,774.75, 28,051.80 and 18,120.60

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Solution

The fourth proportional to 18,774.75, 28,051.80 and 18,120.60 is: 27,074.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,774.75 : 28,051.80 = 18,120.60 : x
  2. Step 2: Convert to fraction form
    18,774.75/28,051.80 = 18,120.60/x
  3. Step 3: Cross multiply
    18,774.75x = 28,051.80 × 18,120.60
  4. Step 4: Simplify right side
    18,774.75x = 508,315,447.08
  5. Step 5: Solve for x
    x = 508,315,447.08/18,774.75
  6. Step 6: Final answer
    x = 27,074.42

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.