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Finding the Fourth Proportional to 20,754.66, 28,645.70 and 12,689.70

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Solution

The fourth proportional to 20,754.66, 28,645.70 and 12,689.70 is: 17,514.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,754.66 : 28,645.70 = 12,689.70 : x
  2. Step 2: Convert to fraction form
    20,754.66/28,645.70 = 12,689.70/x
  3. Step 3: Cross multiply
    20,754.66x = 28,645.70 × 12,689.70
  4. Step 4: Simplify right side
    20,754.66x = 363,505,239.80
  5. Step 5: Solve for x
    x = 363,505,239.80/20,754.66
  6. Step 6: Final answer
    x = 17,514.39

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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.