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Finding the Fourth Proportional to 18,788.95, 28,036.40 and 18,679.60

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Solution

The fourth proportional to 18,788.95, 28,036.40 and 18,679.60 is: 27,873.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,788.95 : 28,036.40 = 18,679.60 : x
  2. Step 2: Convert to fraction form
    18,788.95/28,036.40 = 18,679.60/x
  3. Step 3: Cross multiply
    18,788.95x = 28,036.40 × 18,679.60
  4. Step 4: Simplify right side
    18,788.95x = 523,708,737.44
  5. Step 5: Solve for x
    x = 523,708,737.44/18,788.95
  6. Step 6: Final answer
    x = 27,873.23

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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.