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Finding the Fourth Proportional to 20,009.88, 30,019.86 and 6,858.72

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Solution

The fourth proportional to 20,009.88, 30,019.86 and 6,858.72 is: 10,289.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,009.88 : 30,019.86 = 6,858.72 : x
  2. Step 2: Convert to fraction form
    20,009.88/30,019.86 = 6,858.72/x
  3. Step 3: Cross multiply
    20,009.88x = 30,019.86 × 6,858.72
  4. Step 4: Simplify right side
    20,009.88x = 205,897,814.18
  5. Step 5: Solve for x
    x = 205,897,814.18/20,009.88
  6. Step 6: Final answer
    x = 10,289.81

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.