Home / 20,942.68-28,908.50-13,871.40

Finding the Fourth Proportional to 20,942.68, 28,908.50 and 13,871.40

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Solution

The fourth proportional to 20,942.68, 28,908.50 and 13,871.40 is: 19,147.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,942.68 : 28,908.50 = 13,871.40 : x
  2. Step 2: Convert to fraction form
    20,942.68/28,908.50 = 13,871.40/x
  3. Step 3: Cross multiply
    20,942.68x = 28,908.50 × 13,871.40
  4. Step 4: Simplify right side
    20,942.68x = 401,001,366.90
  5. Step 5: Solve for x
    x = 401,001,366.90/20,942.68
  6. Step 6: Final answer
    x = 19,147.57

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.