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Finding the Fourth Proportional to 9,999.90, 13,858.19 and 9,858.96

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Solution

The fourth proportional to 9,999.90, 13,858.19 and 9,858.96 is: 13,662.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,999.90 : 13,858.19 = 9,858.96 : x
  2. Step 2: Convert to fraction form
    9,999.90/13,858.19 = 9,858.96/x
  3. Step 3: Cross multiply
    9,999.90x = 13,858.19 × 9,858.96
  4. Step 4: Simplify right side
    9,999.90x = 136,627,291.59
  5. Step 5: Solve for x
    x = 136,627,291.59/9,999.90
  6. Step 6: Final answer
    x = 13,662.87

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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.