Home / 20,130.78-27,780.74-11,179.13

Finding the Fourth Proportional to 20,130.78, 27,780.74 and 11,179.13

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Solution

The fourth proportional to 20,130.78, 27,780.74 and 11,179.13 is: 15,427.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,130.78 : 27,780.74 = 11,179.13 : x
  2. Step 2: Convert to fraction form
    20,130.78/27,780.74 = 11,179.13/x
  3. Step 3: Cross multiply
    20,130.78x = 27,780.74 × 11,179.13
  4. Step 4: Simplify right side
    20,130.78x = 310,564,309.16
  5. Step 5: Solve for x
    x = 310,564,309.16/20,130.78
  6. Step 6: Final answer
    x = 15,427.34

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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.