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Finding the Fourth Proportional to 1,359,968.40, 2,039,369.40 and 685,789.20

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Solution

The fourth proportional to 1,359,968.40, 2,039,369.40 and 685,789.20 is: 1,028,389.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,359,968.40 : 2,039,369.40 = 685,789.20 : x
  2. Step 2: Convert to fraction form
    1,359,968.40/2,039,369.40 = 685,789.20/x
  3. Step 3: Cross multiply
    1,359,968.40x = 2,039,369.40 × 685,789.20
  4. Step 4: Simplify right side
    1,359,968.40x = 1,398,577,509,330.48
  5. Step 5: Solve for x
    x = 1,398,577,509,330.48/1,359,968.40
  6. Step 6: Final answer
    x = 1,028,389.71

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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.