Home / 12,785.89-19,181.45-5,390.35

Finding the Fourth Proportional to 12,785.89, 19,181.45 and 5,390.35

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Solution

The fourth proportional to 12,785.89, 19,181.45 and 5,390.35 is: 8,086.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,785.89 : 19,181.45 = 5,390.35 : x
  2. Step 2: Convert to fraction form
    12,785.89/19,181.45 = 5,390.35/x
  3. Step 3: Cross multiply
    12,785.89x = 19,181.45 × 5,390.35
  4. Step 4: Simplify right side
    12,785.89x = 103,394,729.01
  5. Step 5: Solve for x
    x = 103,394,729.01/12,785.89
  6. Step 6: Final answer
    x = 8,086.63

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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.