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Finding the Fourth Proportional to 8,669,920.20, 13,004,880.30 and 8,138,479.20

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Solution

The fourth proportional to 8,669,920.20, 13,004,880.30 and 8,138,479.20 is: 12,207,718.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,669,920.20 : 13,004,880.30 = 8,138,479.20 : x
  2. Step 2: Convert to fraction form
    8,669,920.20/13,004,880.30 = 8,138,479.20/x
  3. Step 3: Cross multiply
    8,669,920.20x = 13,004,880.30 × 8,138,479.20
  4. Step 4: Simplify right side
    8,669,920.20x = 105,839,947,820,039.77
  5. Step 5: Solve for x
    x = 105,839,947,820,039.77/8,669,920.20
  6. Step 6: Final answer
    x = 12,207,718.80

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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.