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Finding the Fourth Proportional to 718,814.93, 991,964.61 and 396,525.78

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Solution

The fourth proportional to 718,814.93, 991,964.61 and 396,525.78 is: 547,205.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    718,814.93 : 991,964.61 = 396,525.78 : x
  2. Step 2: Convert to fraction form
    718,814.93/991,964.61 = 396,525.78/x
  3. Step 3: Cross multiply
    718,814.93x = 991,964.61 × 396,525.78
  4. Step 4: Simplify right side
    718,814.93x = 393,339,540,712.65
  5. Step 5: Solve for x
    x = 393,339,540,712.65/718,814.93
  6. Step 6: Final answer
    x = 547,205.58

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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.