Home / 20,918.20-28,867.05-12,534.70

Finding the Fourth Proportional to 20,918.20, 28,867.05 and 12,534.70

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Solution

The fourth proportional to 20,918.20, 28,867.05 and 12,534.70 is: 17,297.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,918.20 : 28,867.05 = 12,534.70 : x
  2. Step 2: Convert to fraction form
    20,918.20/28,867.05 = 12,534.70/x
  3. Step 3: Cross multiply
    20,918.20x = 28,867.05 × 12,534.70
  4. Step 4: Simplify right side
    20,918.20x = 361,839,604.63
  5. Step 5: Solve for x
    x = 361,839,604.63/20,918.20
  6. Step 6: Final answer
    x = 17,297.84

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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.