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Finding the Fourth Proportional to 20,649,626.40, 30,974,439.60 and 12,587,469.60

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Solution

The fourth proportional to 20,649,626.40, 30,974,439.60 and 12,587,469.60 is: 18,881,204.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,649,626.40 : 30,974,439.60 = 12,587,469.60 : x
  2. Step 2: Convert to fraction form
    20,649,626.40/30,974,439.60 = 12,587,469.60/x
  3. Step 3: Cross multiply
    20,649,626.40x = 30,974,439.60 × 12,587,469.60
  4. Step 4: Simplify right side
    20,649,626.40x = 389,889,816,842,036.19
  5. Step 5: Solve for x
    x = 389,889,816,842,036.19/20,649,626.40
  6. Step 6: Final answer
    x = 18,881,204.40

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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.