Home / 20,991.57-28,974.15-14,288.42

Finding the Fourth Proportional to 20,991.57, 28,974.15 and 14,288.42

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Solution

The fourth proportional to 20,991.57, 28,974.15 and 14,288.42 is: 19,721.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,991.57 : 28,974.15 = 14,288.42 : x
  2. Step 2: Convert to fraction form
    20,991.57/28,974.15 = 14,288.42/x
  3. Step 3: Cross multiply
    20,991.57x = 28,974.15 × 14,288.42
  4. Step 4: Simplify right side
    20,991.57x = 413,994,679.47
  5. Step 5: Solve for x
    x = 413,994,679.47/20,991.57
  6. Step 6: Final answer
    x = 19,721.95

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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.