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Finding the Fourth Proportional to 13,359.60, 20,039.40 and 12,790.80

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Solution

The fourth proportional to 13,359.60, 20,039.40 and 12,790.80 is: 19,186.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,359.60 : 20,039.40 = 12,790.80 : x
  2. Step 2: Convert to fraction form
    13,359.60/20,039.40 = 12,790.80/x
  3. Step 3: Cross multiply
    13,359.60x = 20,039.40 × 12,790.80
  4. Step 4: Simplify right side
    13,359.60x = 256,319,957.52
  5. Step 5: Solve for x
    x = 256,319,957.52/13,359.60
  6. Step 6: Final answer
    x = 19,186.20

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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.