Home / 12,920.45-19,380.74-5,129.25

Finding the Fourth Proportional to 12,920.45, 19,380.74 and 5,129.25

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Solution

The fourth proportional to 12,920.45, 19,380.74 and 5,129.25 is: 7,693.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,920.45 : 19,380.74 = 5,129.25 : x
  2. Step 2: Convert to fraction form
    12,920.45/19,380.74 = 5,129.25/x
  3. Step 3: Cross multiply
    12,920.45x = 19,380.74 × 5,129.25
  4. Step 4: Simplify right side
    12,920.45x = 99,408,635.00
  5. Step 5: Solve for x
    x = 99,408,635.00/12,920.45
  6. Step 6: Final answer
    x = 7,693.90

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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.