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Finding the Fourth Proportional to 20,991.63, 28,959.07 and 14,183.45

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Solution

The fourth proportional to 20,991.63, 28,959.07 and 14,183.45 is: 19,566.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,991.63 : 28,959.07 = 14,183.45 : x
  2. Step 2: Convert to fraction form
    20,991.63/28,959.07 = 14,183.45/x
  3. Step 3: Cross multiply
    20,991.63x = 28,959.07 × 14,183.45
  4. Step 4: Simplify right side
    20,991.63x = 410,739,521.39
  5. Step 5: Solve for x
    x = 410,739,521.39/20,991.63
  6. Step 6: Final answer
    x = 19,566.82

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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.