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Finding the Fourth Proportional to 1,296,728.40, 1,943,780.40 and 763,975.20

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Solution

The fourth proportional to 1,296,728.40, 1,943,780.40 and 763,975.20 is: 1,145,189.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,296,728.40 : 1,943,780.40 = 763,975.20 : x
  2. Step 2: Convert to fraction form
    1,296,728.40/1,943,780.40 = 763,975.20/x
  3. Step 3: Cross multiply
    1,296,728.40x = 1,943,780.40 × 763,975.20
  4. Step 4: Simplify right side
    1,296,728.40x = 1,485,000,019,846.08
  5. Step 5: Solve for x
    x = 1,485,000,019,846.08/1,296,728.40
  6. Step 6: Final answer
    x = 1,145,189.71

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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.