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Finding the Fourth Proportional to 18,819.95, 28,205.31 and 7,713.63

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Solution

The fourth proportional to 18,819.95, 28,205.31 and 7,713.63 is: 11,560.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,819.95 : 28,205.31 = 7,713.63 : x
  2. Step 2: Convert to fraction form
    18,819.95/28,205.31 = 7,713.63/x
  3. Step 3: Cross multiply
    18,819.95x = 28,205.31 × 7,713.63
  4. Step 4: Simplify right side
    18,819.95x = 217,565,325.38
  5. Step 5: Solve for x
    x = 217,565,325.38/18,819.95
  6. Step 6: Final answer
    x = 11,560.36

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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.