Home / 20,709.68-31,013.88-10,857.20

Finding the Fourth Proportional to 20,709.68, 31,013.88 and 10,857.20

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Solution

The fourth proportional to 20,709.68, 31,013.88 and 10,857.20 is: 16,259.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,709.68 : 31,013.88 = 10,857.20 : x
  2. Step 2: Convert to fraction form
    20,709.68/31,013.88 = 10,857.20/x
  3. Step 3: Cross multiply
    20,709.68x = 31,013.88 × 10,857.20
  4. Step 4: Simplify right side
    20,709.68x = 336,723,897.94
  5. Step 5: Solve for x
    x = 336,723,897.94/20,709.68
  6. Step 6: Final answer
    x = 16,259.25

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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.