Home / 20,715.10-31,072.65-10,857.40

Finding the Fourth Proportional to 20,715.10, 31,072.65 and 10,857.40

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Solution

The fourth proportional to 20,715.10, 31,072.65 and 10,857.40 is: 16,286.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,715.10 : 31,072.65 = 10,857.40 : x
  2. Step 2: Convert to fraction form
    20,715.10/31,072.65 = 10,857.40/x
  3. Step 3: Cross multiply
    20,715.10x = 31,072.65 × 10,857.40
  4. Step 4: Simplify right side
    20,715.10x = 337,368,190.11
  5. Step 5: Solve for x
    x = 337,368,190.11/20,715.10
  6. Step 6: Final answer
    x = 16,286.10

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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.