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Finding the Fourth Proportional to 9,909.80, 13,684.78 and 6,379.14

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Solution

The fourth proportional to 9,909.80, 13,684.78 and 6,379.14 is: 8,809.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,909.80 : 13,684.78 = 6,379.14 : x
  2. Step 2: Convert to fraction form
    9,909.80/13,684.78 = 6,379.14/x
  3. Step 3: Cross multiply
    9,909.80x = 13,684.78 × 6,379.14
  4. Step 4: Simplify right side
    9,909.80x = 87,297,127.49
  5. Step 5: Solve for x
    x = 87,297,127.49/9,909.80
  6. Step 6: Final answer
    x = 8,809.17

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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.