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Finding the Fourth Proportional to 14,008.86, 20,991.38 and 11,920.28

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Solution

The fourth proportional to 14,008.86, 20,991.38 and 11,920.28 is: 17,861.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    14,008.86 : 20,991.38 = 11,920.28 : x
  2. Step 2: Convert to fraction form
    14,008.86/20,991.38 = 11,920.28/x
  3. Step 3: Cross multiply
    14,008.86x = 20,991.38 × 11,920.28
  4. Step 4: Simplify right side
    14,008.86x = 250,222,962.63
  5. Step 5: Solve for x
    x = 250,222,962.63/14,008.86
  6. Step 6: Final answer
    x = 17,861.76

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.