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Finding the Fourth Proportional to 19,959,661.20, 29,939,491.80 and 12,401,389.20

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Solution

The fourth proportional to 19,959,661.20, 29,939,491.80 and 12,401,389.20 is: 18,602,083.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,959,661.20 : 29,939,491.80 = 12,401,389.20 : x
  2. Step 2: Convert to fraction form
    19,959,661.20/29,939,491.80 = 12,401,389.20/x
  3. Step 3: Cross multiply
    19,959,661.20x = 29,939,491.80 × 12,401,389.20
  4. Step 4: Simplify right side
    19,959,661.20x = 371,291,290,262,008.56
  5. Step 5: Solve for x
    x = 371,291,290,262,008.56/19,959,661.20
  6. Step 6: Final answer
    x = 18,602,083.80

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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.