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Finding the Fourth Proportional to 9,369.18, 12,909.78 and 6,379.74

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Solution

The fourth proportional to 9,369.18, 12,909.78 and 6,379.74 is: 8,790.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,369.18 : 12,909.78 = 6,379.74 : x
  2. Step 2: Convert to fraction form
    9,369.18/12,909.78 = 6,379.74/x
  3. Step 3: Cross multiply
    9,369.18x = 12,909.78 × 6,379.74
  4. Step 4: Simplify right side
    9,369.18x = 82,361,039.86
  5. Step 5: Solve for x
    x = 82,361,039.86/9,369.18
  6. Step 6: Final answer
    x = 8,790.63

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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.