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Finding the Fourth Proportional to 18,963.40, 28,449.06 and 7,276.54

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Solution

The fourth proportional to 18,963.40, 28,449.06 and 7,276.54 is: 10,916.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,963.40 : 28,449.06 = 7,276.54 : x
  2. Step 2: Convert to fraction form
    18,963.40/28,449.06 = 7,276.54/x
  3. Step 3: Cross multiply
    18,963.40x = 28,449.06 × 7,276.54
  4. Step 4: Simplify right side
    18,963.40x = 207,010,723.05
  5. Step 5: Solve for x
    x = 207,010,723.05/18,963.40
  6. Step 6: Final answer
    x = 10,916.33

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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.