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Finding the Fourth Proportional to 13,344.80, 19,995.60 and 8,405.60

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Solution

The fourth proportional to 13,344.80, 19,995.60 and 8,405.60 is: 12,594.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,344.80 : 19,995.60 = 8,405.60 : x
  2. Step 2: Convert to fraction form
    13,344.80/19,995.60 = 8,405.60/x
  3. Step 3: Cross multiply
    13,344.80x = 19,995.60 × 8,405.60
  4. Step 4: Simplify right side
    13,344.80x = 168,075,015.36
  5. Step 5: Solve for x
    x = 168,075,015.36/13,344.80
  6. Step 6: Final answer
    x = 12,594.79

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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.