Home / 20,929.18-28,889.85-13,857.88

Finding the Fourth Proportional to 20,929.18, 28,889.85 and 13,857.88

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Solution

The fourth proportional to 20,929.18, 28,889.85 and 13,857.88 is: 19,128.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,929.18 : 28,889.85 = 13,857.88 : x
  2. Step 2: Convert to fraction form
    20,929.18/28,889.85 = 13,857.88/x
  3. Step 3: Cross multiply
    20,929.18x = 28,889.85 × 13,857.88
  4. Step 4: Simplify right side
    20,929.18x = 400,352,074.52
  5. Step 5: Solve for x
    x = 400,352,074.52/20,929.18
  6. Step 6: Final answer
    x = 19,128.89

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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.