Home / 12,780.21-19,177.22-5,389.81

Finding the Fourth Proportional to 12,780.21, 19,177.22 and 5,389.81

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Solution

The fourth proportional to 12,780.21, 19,177.22 and 5,389.81 is: 8,087.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,780.21 : 19,177.22 = 5,389.81 : x
  2. Step 2: Convert to fraction form
    12,780.21/19,177.22 = 5,389.81/x
  3. Step 3: Cross multiply
    12,780.21x = 19,177.22 × 5,389.81
  4. Step 4: Simplify right side
    12,780.21x = 103,361,537.66
  5. Step 5: Solve for x
    x = 103,361,537.66/12,780.21
  6. Step 6: Final answer
    x = 8,087.62

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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.