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Finding the Fourth Proportional to 18,891.73, 28,312.93 and 7,785.73

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Solution

The fourth proportional to 18,891.73, 28,312.93 and 7,785.73 is: 11,668.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,891.73 : 28,312.93 = 7,785.73 : x
  2. Step 2: Convert to fraction form
    18,891.73/28,312.93 = 7,785.73/x
  3. Step 3: Cross multiply
    18,891.73x = 28,312.93 × 7,785.73
  4. Step 4: Simplify right side
    18,891.73x = 220,436,828.49
  5. Step 5: Solve for x
    x = 220,436,828.49/18,891.73
  6. Step 6: Final answer
    x = 11,668.43

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.