Home / 20,929.92-28,890.87-13,858.62

Finding the Fourth Proportional to 20,929.92, 28,890.87 and 13,858.62

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Solution

The fourth proportional to 20,929.92, 28,890.87 and 13,858.62 is: 19,129.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,929.92 : 28,890.87 = 13,858.62 : x
  2. Step 2: Convert to fraction form
    20,929.92/28,890.87 = 13,858.62/x
  3. Step 3: Cross multiply
    20,929.92x = 28,890.87 × 13,858.62
  4. Step 4: Simplify right side
    20,929.92x = 400,387,588.80
  5. Step 5: Solve for x
    x = 400,387,588.80/20,929.92
  6. Step 6: Final answer
    x = 19,129.91

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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.