Home / 20,855.21-28,780.57-11,423.17

Finding the Fourth Proportional to 20,855.21, 28,780.57 and 11,423.17

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Solution

The fourth proportional to 20,855.21, 28,780.57 and 11,423.17 is: 15,764.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,855.21 : 28,780.57 = 11,423.17 : x
  2. Step 2: Convert to fraction form
    20,855.21/28,780.57 = 11,423.17/x
  3. Step 3: Cross multiply
    20,855.21x = 28,780.57 × 11,423.17
  4. Step 4: Simplify right side
    20,855.21x = 328,765,142.79
  5. Step 5: Solve for x
    x = 328,765,142.79/20,855.21
  6. Step 6: Final answer
    x = 15,764.17

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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.