Home / 13,881.78-19,145.70-11,720.70

Finding the Fourth Proportional to 13,881.78, 19,145.70 and 11,720.70

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Solution

The fourth proportional to 13,881.78, 19,145.70 and 11,720.70 is: 16,165.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,881.78 : 19,145.70 = 11,720.70 : x
  2. Step 2: Convert to fraction form
    13,881.78/19,145.70 = 11,720.70/x
  3. Step 3: Cross multiply
    13,881.78x = 19,145.70 × 11,720.70
  4. Step 4: Simplify right side
    13,881.78x = 224,401,005.99
  5. Step 5: Solve for x
    x = 224,401,005.99/13,881.78
  6. Step 6: Final answer
    x = 16,165.15

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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.