Home / 20,859.49-28,785.81-11,428.12

Finding the Fourth Proportional to 20,859.49, 28,785.81 and 11,428.12

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Solution

The fourth proportional to 20,859.49, 28,785.81 and 11,428.12 is: 15,770.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,859.49 : 28,785.81 = 11,428.12 : x
  2. Step 2: Convert to fraction form
    20,859.49/28,785.81 = 11,428.12/x
  3. Step 3: Cross multiply
    20,859.49x = 28,785.81 × 11,428.12
  4. Step 4: Simplify right side
    20,859.49x = 328,967,690.98
  5. Step 5: Solve for x
    x = 328,967,690.98/20,859.49
  6. Step 6: Final answer
    x = 15,770.65

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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.