Home / 20,929.96-28,872.61-13,758.90

Finding the Fourth Proportional to 20,929.96, 28,872.61 and 13,758.90

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Solution

The fourth proportional to 20,929.96, 28,872.61 and 13,758.90 is: 18,980.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,929.96 : 28,872.61 = 13,758.90 : x
  2. Step 2: Convert to fraction form
    20,929.96/28,872.61 = 13,758.90/x
  3. Step 3: Cross multiply
    20,929.96x = 28,872.61 × 13,758.90
  4. Step 4: Simplify right side
    20,929.96x = 397,255,353.73
  5. Step 5: Solve for x
    x = 397,255,353.73/20,929.96
  6. Step 6: Final answer
    x = 18,980.23

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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.