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Finding the Fourth Proportional to 12,578,661.72, 18,868,411.76 and 3,479,996.93

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Solution

The fourth proportional to 12,578,661.72, 18,868,411.76 and 3,479,996.93 is: 5,220,111.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,578,661.72 : 18,868,411.76 = 3,479,996.93 : x
  2. Step 2: Convert to fraction form
    12,578,661.72/18,868,411.76 = 3,479,996.93/x
  3. Step 3: Cross multiply
    12,578,661.72x = 18,868,411.76 × 3,479,996.93
  4. Step 4: Simplify right side
    12,578,661.72x = 65,662,014,887,033.84
  5. Step 5: Solve for x
    x = 65,662,014,887,033.84/12,578,661.72
  6. Step 6: Final answer
    x = 5,220,111.36

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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.