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Finding the Fourth Proportional to 13,478.40, 18,662.40 and 13,219.20

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Solution

The fourth proportional to 13,478.40, 18,662.40 and 13,219.20 is: 18,303.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,478.40 : 18,662.40 = 13,219.20 : x
  2. Step 2: Convert to fraction form
    13,478.40/18,662.40 = 13,219.20/x
  3. Step 3: Cross multiply
    13,478.40x = 18,662.40 × 13,219.20
  4. Step 4: Simplify right side
    13,478.40x = 246,701,998.08
  5. Step 5: Solve for x
    x = 246,701,998.08/13,478.40
  6. Step 6: Final answer
    x = 18,303.51

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1.5x scale

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.