Home / 21,213.40-31,820.10-20,727.40

Finding the Fourth Proportional to 21,213.40, 31,820.10 and 20,727.40

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Solution

The fourth proportional to 21,213.40, 31,820.10 and 20,727.40 is: 31,091.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,213.40 : 31,820.10 = 20,727.40 : x
  2. Step 2: Convert to fraction form
    21,213.40/31,820.10 = 20,727.40/x
  3. Step 3: Cross multiply
    21,213.40x = 31,820.10 × 20,727.40
  4. Step 4: Simplify right side
    21,213.40x = 659,547,940.74
  5. Step 5: Solve for x
    x = 659,547,940.74/21,213.40
  6. Step 6: Final answer
    x = 31,091.10

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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.