Home / 1,386,919.20-2,080,378.80-640,423.20

Finding the Fourth Proportional to 1,386,919.20, 2,080,378.80 and 640,423.20

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Solution

The fourth proportional to 1,386,919.20, 2,080,378.80 and 640,423.20 is: 960,634.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,386,919.20 : 2,080,378.80 = 640,423.20 : x
  2. Step 2: Convert to fraction form
    1,386,919.20/2,080,378.80 = 640,423.20/x
  3. Step 3: Cross multiply
    1,386,919.20x = 2,080,378.80 × 640,423.20
  4. Step 4: Simplify right side
    1,386,919.20x = 1,332,322,848,308.16
  5. Step 5: Solve for x
    x = 1,332,322,848,308.16/1,386,919.20
  6. Step 6: Final answer
    x = 960,634.80

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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.