Home / 20,645.61-28,488.09-12,142.71

Finding the Fourth Proportional to 20,645.61, 28,488.09 and 12,142.71

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Solution

The fourth proportional to 20,645.61, 28,488.09 and 12,142.71 is: 16,755.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,645.61 : 28,488.09 = 12,142.71 : x
  2. Step 2: Convert to fraction form
    20,645.61/28,488.09 = 12,142.71/x
  3. Step 3: Cross multiply
    20,645.61x = 28,488.09 × 12,142.71
  4. Step 4: Simplify right side
    20,645.61x = 345,922,615.32
  5. Step 5: Solve for x
    x = 345,922,615.32/20,645.61
  6. Step 6: Final answer
    x = 16,755.26

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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.