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Finding the Fourth Proportional to 13,970,039.20, 20,955,058.80 and 12,290,423.20

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Solution

The fourth proportional to 13,970,039.20, 20,955,058.80 and 12,290,423.20 is: 18,435,634.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,970,039.20 : 20,955,058.80 = 12,290,423.20 : x
  2. Step 2: Convert to fraction form
    13,970,039.20/20,955,058.80 = 12,290,423.20/x
  3. Step 3: Cross multiply
    13,970,039.20x = 20,955,058.80 × 12,290,423.20
  4. Step 4: Simplify right side
    13,970,039.20x = 257,546,540,832,884.16
  5. Step 5: Solve for x
    x = 257,546,540,832,884.16/13,970,039.20
  6. Step 6: Final answer
    x = 18,435,634.80

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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.