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Finding the Fourth Proportional to 718,105.20, 990,980.20 and 395,815.56

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Solution

The fourth proportional to 718,105.20, 990,980.20 and 395,815.56 is: 546,222.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    718,105.20 : 990,980.20 = 395,815.56 : x
  2. Step 2: Convert to fraction form
    718,105.20/990,980.20 = 395,815.56/x
  3. Step 3: Cross multiply
    718,105.20x = 990,980.20 × 395,815.56
  4. Step 4: Simplify right side
    718,105.20x = 392,245,382,811.91
  5. Step 5: Solve for x
    x = 392,245,382,811.91/718,105.20
  6. Step 6: Final answer
    x = 546,222.73

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1.5x scale

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.