Home / 20,660.55-28,516.01-13,117.21

Finding the Fourth Proportional to 20,660.55, 28,516.01 and 13,117.21

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Solution

The fourth proportional to 20,660.55, 28,516.01 and 13,117.21 is: 18,104.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,660.55 : 28,516.01 = 13,117.21 : x
  2. Step 2: Convert to fraction form
    20,660.55/28,516.01 = 13,117.21/x
  3. Step 3: Cross multiply
    20,660.55x = 28,516.01 × 13,117.21
  4. Step 4: Simplify right side
    20,660.55x = 374,050,491.53
  5. Step 5: Solve for x
    x = 374,050,491.53/20,660.55
  6. Step 6: Final answer
    x = 18,104.58

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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.