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Finding the Fourth Proportional to 12,420.36, 18,630.11 and 5,400.36

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Solution

The fourth proportional to 12,420.36, 18,630.11 and 5,400.36 is: 8,100.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,420.36 : 18,630.11 = 5,400.36 : x
  2. Step 2: Convert to fraction form
    12,420.36/18,630.11 = 5,400.36/x
  3. Step 3: Cross multiply
    12,420.36x = 18,630.11 × 5,400.36
  4. Step 4: Simplify right side
    12,420.36x = 100,609,273.84
  5. Step 5: Solve for x
    x = 100,609,273.84/12,420.36
  6. Step 6: Final answer
    x = 8,100.35

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1.5x scale

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.