Home / 12,815.89-19,226.46-5,420.39

Finding the Fourth Proportional to 12,815.89, 19,226.46 and 5,420.39

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Solution

The fourth proportional to 12,815.89, 19,226.46 and 5,420.39 is: 8,131.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,815.89 : 19,226.46 = 5,420.39 : x
  2. Step 2: Convert to fraction form
    12,815.89/19,226.46 = 5,420.39/x
  3. Step 3: Cross multiply
    12,815.89x = 19,226.46 × 5,420.39
  4. Step 4: Simplify right side
    12,815.89x = 104,214,835.71
  5. Step 5: Solve for x
    x = 104,214,835.71/12,815.89
  6. Step 6: Final answer
    x = 8,131.69

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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.