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Finding the Fourth Proportional to 21,978,913.65, 30,332,763.68 and 12,192,510.66

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Solution

The fourth proportional to 21,978,913.65, 30,332,763.68 and 12,192,510.66 is: 16,826,698.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,978,913.65 : 30,332,763.68 = 12,192,510.66 : x
  2. Step 2: Convert to fraction form
    21,978,913.65/30,332,763.68 = 12,192,510.66/x
  3. Step 3: Cross multiply
    21,978,913.65x = 30,332,763.68 × 12,192,510.66
  4. Step 4: Simplify right side
    21,978,913.65x = 369,832,544,454,698.31
  5. Step 5: Solve for x
    x = 369,832,544,454,698.31/21,978,913.65
  6. Step 6: Final answer
    x = 16,826,698.10

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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.