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Finding the Fourth Proportional to 654,418.80, 981,628.20 and 388,479.60

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Solution

The fourth proportional to 654,418.80, 981,628.20 and 388,479.60 is: 582,719.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    654,418.80 : 981,628.20 = 388,479.60 : x
  2. Step 2: Convert to fraction form
    654,418.80/981,628.20 = 388,479.60/x
  3. Step 3: Cross multiply
    654,418.80x = 981,628.20 × 388,479.60
  4. Step 4: Simplify right side
    654,418.80x = 381,342,530,484.72
  5. Step 5: Solve for x
    x = 381,342,530,484.72/654,418.80
  6. Step 6: Final answer
    x = 582,719.40

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1.5x scale

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.