Home / 20,742.97-28,624.35-12,690.03

Finding the Fourth Proportional to 20,742.97, 28,624.35 and 12,690.03

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Solution

The fourth proportional to 20,742.97, 28,624.35 and 12,690.03 is: 17,511.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,742.97 : 28,624.35 = 12,690.03 : x
  2. Step 2: Convert to fraction form
    20,742.97/28,624.35 = 12,690.03/x
  3. Step 3: Cross multiply
    20,742.97x = 28,624.35 × 12,690.03
  4. Step 4: Simplify right side
    20,742.97x = 363,243,860.23
  5. Step 5: Solve for x
    x = 363,243,860.23/20,742.97
  6. Step 6: Final answer
    x = 17,511.66

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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.