Home / 20,857.05-31,280.10-7,713.18

Finding the Fourth Proportional to 20,857.05, 31,280.10 and 7,713.18

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Solution

The fourth proportional to 20,857.05, 31,280.10 and 7,713.18 is: 11,567.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,857.05 : 31,280.10 = 7,713.18 : x
  2. Step 2: Convert to fraction form
    20,857.05/31,280.10 = 7,713.18/x
  3. Step 3: Cross multiply
    20,857.05x = 31,280.10 × 7,713.18
  4. Step 4: Simplify right side
    20,857.05x = 241,269,041.72
  5. Step 5: Solve for x
    x = 241,269,041.72/20,857.05
  6. Step 6: Final answer
    x = 11,567.75

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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.