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Finding the Fourth Proportional to 18,672.82, 28,013.61 and 7,428.80

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Solution

The fourth proportional to 18,672.82, 28,013.61 and 7,428.80 is: 11,144.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,672.82 : 28,013.61 = 7,428.80 : x
  2. Step 2: Convert to fraction form
    18,672.82/28,013.61 = 7,428.80/x
  3. Step 3: Cross multiply
    18,672.82x = 28,013.61 × 7,428.80
  4. Step 4: Simplify right side
    18,672.82x = 208,107,328.76
  5. Step 5: Solve for x
    x = 208,107,328.76/18,672.82
  6. Step 6: Final answer
    x = 11,144.93

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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.