Home / 12,921.60-19,382.40-3,686.40

Finding the Fourth Proportional to 12,921.60, 19,382.40 and 3,686.40

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Solution

The fourth proportional to 12,921.60, 19,382.40 and 3,686.40 is: 5,529.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,921.60 : 19,382.40 = 3,686.40 : x
  2. Step 2: Convert to fraction form
    12,921.60/19,382.40 = 3,686.40/x
  3. Step 3: Cross multiply
    12,921.60x = 19,382.40 × 3,686.40
  4. Step 4: Simplify right side
    12,921.60x = 71,451,279.36
  5. Step 5: Solve for x
    x = 71,451,279.36/12,921.60
  6. Step 6: Final answer
    x = 5,529.60

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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.