Home / 12,990.40-19,485.60-4,226.20

Finding the Fourth Proportional to 12,990.40, 19,485.60 and 4,226.20

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Solution

The fourth proportional to 12,990.40, 19,485.60 and 4,226.20 is: 6,339.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,990.40 : 19,485.60 = 4,226.20 : x
  2. Step 2: Convert to fraction form
    12,990.40/19,485.60 = 4,226.20/x
  3. Step 3: Cross multiply
    12,990.40x = 19,485.60 × 4,226.20
  4. Step 4: Simplify right side
    12,990.40x = 82,350,042.72
  5. Step 5: Solve for x
    x = 82,350,042.72/12,990.40
  6. Step 6: Final answer
    x = 6,339.30

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Half scale
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Double scale
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Similar ratio
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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.