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Finding the Fourth Proportional to 14,793.45, 20,413.13 and 8,420.87

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Solution

The fourth proportional to 14,793.45, 20,413.13 and 8,420.87 is: 11,619.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    14,793.45 : 20,413.13 = 8,420.87 : x
  2. Step 2: Convert to fraction form
    14,793.45/20,413.13 = 8,420.87/x
  3. Step 3: Cross multiply
    14,793.45x = 20,413.13 × 8,420.87
  4. Step 4: Simplify right side
    14,793.45x = 171,896,169.85
  5. Step 5: Solve for x
    x = 171,896,169.85/14,793.45
  6. Step 6: Final answer
    x = 11,619.75

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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.