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Finding the Fourth Proportional to 978,919.20, 1,468,378.80 and 680,320.80

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Solution

The fourth proportional to 978,919.20, 1,468,378.80 and 680,320.80 is: 1,020,481.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    978,919.20 : 1,468,378.80 = 680,320.80 : x
  2. Step 2: Convert to fraction form
    978,919.20/1,468,378.80 = 680,320.80/x
  3. Step 3: Cross multiply
    978,919.20x = 1,468,378.80 × 680,320.80
  4. Step 4: Simplify right side
    978,919.20x = 998,968,639,919.04
  5. Step 5: Solve for x
    x = 998,968,639,919.04/978,919.20
  6. Step 6: Final answer
    x = 1,020,481.20

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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.