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Finding the Fourth Proportional to 13,642.98, 18,821.18 and 8,336.80

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Solution

The fourth proportional to 13,642.98, 18,821.18 and 8,336.80 is: 11,501.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,642.98 : 18,821.18 = 8,336.80 : x
  2. Step 2: Convert to fraction form
    13,642.98/18,821.18 = 8,336.80/x
  3. Step 3: Cross multiply
    13,642.98x = 18,821.18 × 8,336.80
  4. Step 4: Simplify right side
    13,642.98x = 156,908,413.42
  5. Step 5: Solve for x
    x = 156,908,413.42/13,642.98
  6. Step 6: Final answer
    x = 11,501.04

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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.