Home / 13,638.78-20,358.68-11,978.06

Finding the Fourth Proportional to 13,638.78, 20,358.68 and 11,978.06

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Solution

The fourth proportional to 13,638.78, 20,358.68 and 11,978.06 is: 17,879.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,638.78 : 20,358.68 = 11,978.06 : x
  2. Step 2: Convert to fraction form
    13,638.78/20,358.68 = 11,978.06/x
  3. Step 3: Cross multiply
    13,638.78x = 20,358.68 × 11,978.06
  4. Step 4: Simplify right side
    13,638.78x = 243,857,328.88
  5. Step 5: Solve for x
    x = 243,857,328.88/13,638.78
  6. Step 6: Final answer
    x = 17,879.70

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.