Home / 12,938.80-19,408.20-9,857.56

Finding the Fourth Proportional to 12,938.80, 19,408.20 and 9,857.56

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Solution

The fourth proportional to 12,938.80, 19,408.20 and 9,857.56 is: 14,786.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,938.80 : 19,408.20 = 9,857.56 : x
  2. Step 2: Convert to fraction form
    12,938.80/19,408.20 = 9,857.56/x
  3. Step 3: Cross multiply
    12,938.80x = 19,408.20 × 9,857.56
  4. Step 4: Simplify right side
    12,938.80x = 191,317,495.99
  5. Step 5: Solve for x
    x = 191,317,495.99/12,938.80
  6. Step 6: Final answer
    x = 14,786.34

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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.