Home / 12,780.42-17,637.79-7,745.09

Finding the Fourth Proportional to 12,780.42, 17,637.79 and 7,745.09

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Solution

The fourth proportional to 12,780.42, 17,637.79 and 7,745.09 is: 10,688.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,780.42 : 17,637.79 = 7,745.09 : x
  2. Step 2: Convert to fraction form
    12,780.42/17,637.79 = 7,745.09/x
  3. Step 3: Cross multiply
    12,780.42x = 17,637.79 × 7,745.09
  4. Step 4: Simplify right side
    12,780.42x = 136,606,163.40
  5. Step 5: Solve for x
    x = 136,606,163.40/12,780.42
  6. Step 6: Final answer
    x = 10,688.71

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.