Home / 21,138.42-31,738.68-20,765.10

Finding the Fourth Proportional to 21,138.42, 31,738.68 and 20,765.10

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Solution

The fourth proportional to 21,138.42, 31,738.68 and 20,765.10 is: 31,178.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,138.42 : 31,738.68 = 20,765.10 : x
  2. Step 2: Convert to fraction form
    21,138.42/31,738.68 = 20,765.10/x
  3. Step 3: Cross multiply
    21,138.42x = 31,738.68 × 20,765.10
  4. Step 4: Simplify right side
    21,138.42x = 659,056,864.07
  5. Step 5: Solve for x
    x = 659,056,864.07/21,138.42
  6. Step 6: Final answer
    x = 31,178.15

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.