Home / 20,942.55-28,900.40-11,510.91

Finding the Fourth Proportional to 20,942.55, 28,900.40 and 11,510.91

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Solution

The fourth proportional to 20,942.55, 28,900.40 and 11,510.91 is: 15,884.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,942.55 : 28,900.40 = 11,510.91 : x
  2. Step 2: Convert to fraction form
    20,942.55/28,900.40 = 11,510.91/x
  3. Step 3: Cross multiply
    20,942.55x = 28,900.40 × 11,510.91
  4. Step 4: Simplify right side
    20,942.55x = 332,669,845.81
  5. Step 5: Solve for x
    x = 332,669,845.81/20,942.55
  6. Step 6: Final answer
    x = 15,884.88

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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.