Home / 20,384.05-28,128.76-11,429.77

Finding the Fourth Proportional to 20,384.05, 28,128.76 and 11,429.77

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Solution

The fourth proportional to 20,384.05, 28,128.76 and 11,429.77 is: 15,772.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,384.05 : 28,128.76 = 11,429.77 : x
  2. Step 2: Convert to fraction form
    20,384.05/28,128.76 = 11,429.77/x
  3. Step 3: Cross multiply
    20,384.05x = 28,128.76 × 11,429.77
  4. Step 4: Simplify right side
    20,384.05x = 321,505,257.19
  5. Step 5: Solve for x
    x = 321,505,257.19/20,384.05
  6. Step 6: Final answer
    x = 15,772.39

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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.