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Finding the Fourth Proportional to 18,745.75, 28,118.90 and 4,894.75

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Solution

The fourth proportional to 18,745.75, 28,118.90 and 4,894.75 is: 7,342.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,745.75 : 28,118.90 = 4,894.75 : x
  2. Step 2: Convert to fraction form
    18,745.75/28,118.90 = 4,894.75/x
  3. Step 3: Cross multiply
    18,745.75x = 28,118.90 × 4,894.75
  4. Step 4: Simplify right side
    18,745.75x = 137,634,985.78
  5. Step 5: Solve for x
    x = 137,634,985.78/18,745.75
  6. Step 6: Final answer
    x = 7,342.20

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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.