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Finding the Fourth Proportional to 720,198.12, 993,788.68 and 397,889

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Solution

The fourth proportional to 720,198.12, 993,788.68 and 397,889 is: 549,040.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    720,198.12 : 993,788.68 = 397,889 : x
  2. Step 2: Convert to fraction form
    720,198.12/993,788.68 = 397,889/x
  3. Step 3: Cross multiply
    720,198.12x = 993,788.68 × 397,889
  4. Step 4: Simplify right side
    720,198.12x = 395,417,584,096.52
  5. Step 5: Solve for x
    x = 395,417,584,096.52/720,198.12
  6. Step 6: Final answer
    x = 549,040.01

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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.