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Finding the Fourth Proportional to 20,869,168.80, 31,266,428.40 and 12,881,661.60

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Solution

The fourth proportional to 20,869,168.80, 31,266,428.40 and 12,881,661.60 is: 19,299,453.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,869,168.80 : 31,266,428.40 = 12,881,661.60 : x
  2. Step 2: Convert to fraction form
    20,869,168.80/31,266,428.40 = 12,881,661.60/x
  3. Step 3: Cross multiply
    20,869,168.80x = 31,266,428.40 × 12,881,661.60
  4. Step 4: Simplify right side
    20,869,168.80x = 402,763,550,089,429.44
  5. Step 5: Solve for x
    x = 402,763,550,089,429.44/20,869,168.80
  6. Step 6: Final answer
    x = 19,299,453.37

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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.