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Finding the Fourth Proportional to 1,434,402.64, 1,979,475.64 and 789,821.28

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Solution

The fourth proportional to 1,434,402.64, 1,979,475.64 and 789,821.28 is: 1,089,953.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,434,402.64 : 1,979,475.64 = 789,821.28 : x
  2. Step 2: Convert to fraction form
    1,434,402.64/1,979,475.64 = 789,821.28/x
  3. Step 3: Cross multiply
    1,434,402.64x = 1,979,475.64 × 789,821.28
  4. Step 4: Simplify right side
    1,434,402.64x = 1,563,431,983,713.62
  5. Step 5: Solve for x
    x = 1,563,431,983,713.62/1,434,402.64
  6. Step 6: Final answer
    x = 1,089,953.36

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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.