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Finding the Fourth Proportional to 26,689.60, 39,991.20 and 16,811.20

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Solution

The fourth proportional to 26,689.60, 39,991.20 and 16,811.20 is: 25,189.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    26,689.60 : 39,991.20 = 16,811.20 : x
  2. Step 2: Convert to fraction form
    26,689.60/39,991.20 = 16,811.20/x
  3. Step 3: Cross multiply
    26,689.60x = 39,991.20 × 16,811.20
  4. Step 4: Simplify right side
    26,689.60x = 672,300,061.44
  5. Step 5: Solve for x
    x = 672,300,061.44/26,689.60
  6. Step 6: Final answer
    x = 25,189.59

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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.