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Finding the Fourth Proportional to 1,433,905.65, 1,978,789.23 and 789,322.50

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Solution

The fourth proportional to 1,433,905.65, 1,978,789.23 and 789,322.50 is: 1,089,264.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,433,905.65 : 1,978,789.23 = 789,322.50 : x
  2. Step 2: Convert to fraction form
    1,433,905.65/1,978,789.23 = 789,322.50/x
  3. Step 3: Cross multiply
    1,433,905.65x = 1,978,789.23 × 789,322.50
  4. Step 4: Simplify right side
    1,433,905.65x = 1,561,902,861,996.68
  5. Step 5: Solve for x
    x = 1,561,902,861,996.68/1,433,905.65
  6. Step 6: Final answer
    x = 1,089,264.74

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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.