Home / 20,855.49-28,780.29-11,424.12

Finding the Fourth Proportional to 20,855.49, 28,780.29 and 11,424.12

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Solution

The fourth proportional to 20,855.49, 28,780.29 and 11,424.12 is: 15,765.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,855.49 : 28,780.29 = 11,424.12 : x
  2. Step 2: Convert to fraction form
    20,855.49/28,780.29 = 11,424.12/x
  3. Step 3: Cross multiply
    20,855.49x = 28,780.29 × 11,424.12
  4. Step 4: Simplify right side
    20,855.49x = 328,789,486.59
  5. Step 5: Solve for x
    x = 328,789,486.59/20,855.49
  6. Step 6: Final answer
    x = 15,765.13

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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.