Home / 20,031.30-27,642.87-11,078.78

Finding the Fourth Proportional to 20,031.30, 27,642.87 and 11,078.78

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Solution

The fourth proportional to 20,031.30, 27,642.87 and 11,078.78 is: 15,288.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,031.30 : 27,642.87 = 11,078.78 : x
  2. Step 2: Convert to fraction form
    20,031.30/27,642.87 = 11,078.78/x
  3. Step 3: Cross multiply
    20,031.30x = 27,642.87 × 11,078.78
  4. Step 4: Simplify right side
    20,031.30x = 306,249,137.08
  5. Step 5: Solve for x
    x = 306,249,137.08/20,031.30
  6. Step 6: Final answer
    x = 15,288.53

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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.