Home / 20,078.37-27,720.81-12,911.49

Finding the Fourth Proportional to 20,078.37, 27,720.81 and 12,911.49

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Solution

The fourth proportional to 20,078.37, 27,720.81 and 12,911.49 is: 17,826.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,078.37 : 27,720.81 = 12,911.49 : x
  2. Step 2: Convert to fraction form
    20,078.37/27,720.81 = 12,911.49/x
  3. Step 3: Cross multiply
    20,078.37x = 27,720.81 × 12,911.49
  4. Step 4: Simplify right side
    20,078.37x = 357,916,961.11
  5. Step 5: Solve for x
    x = 357,916,961.11/20,078.37
  6. Step 6: Final answer
    x = 17,826.00

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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.