Home / 20,138.11-27,800.70-12,588.64

Finding the Fourth Proportional to 20,138.11, 27,800.70 and 12,588.64

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Solution

The fourth proportional to 20,138.11, 27,800.70 and 12,588.64 is: 17,378.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,138.11 : 27,800.70 = 12,588.64 : x
  2. Step 2: Convert to fraction form
    20,138.11/27,800.70 = 12,588.64/x
  3. Step 3: Cross multiply
    20,138.11x = 27,800.70 × 12,588.64
  4. Step 4: Simplify right side
    20,138.11x = 349,972,941.10
  5. Step 5: Solve for x
    x = 349,972,941.10/20,138.11
  6. Step 6: Final answer
    x = 17,378.64

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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.