Home / 12,745.45-19,118.18-3,980.40

Finding the Fourth Proportional to 12,745.45, 19,118.18 and 3,980.40

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Solution

The fourth proportional to 12,745.45, 19,118.18 and 3,980.40 is: 5,970.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,745.45 : 19,118.18 = 3,980.40 : x
  2. Step 2: Convert to fraction form
    12,745.45/19,118.18 = 3,980.40/x
  3. Step 3: Cross multiply
    12,745.45x = 19,118.18 × 3,980.40
  4. Step 4: Simplify right side
    12,745.45x = 76,098,003.67
  5. Step 5: Solve for x
    x = 76,098,003.67/12,745.45
  6. Step 6: Final answer
    x = 5,970.60

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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.