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Finding the Fourth Proportional to 18,973.57, 28,461.74 and 7,286.79

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Solution

The fourth proportional to 18,973.57, 28,461.74 and 7,286.79 is: 10,930.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,973.57 : 28,461.74 = 7,286.79 : x
  2. Step 2: Convert to fraction form
    18,973.57/28,461.74 = 7,286.79/x
  3. Step 3: Cross multiply
    18,973.57x = 28,461.74 × 7,286.79
  4. Step 4: Simplify right side
    18,973.57x = 207,394,722.41
  5. Step 5: Solve for x
    x = 207,394,722.41/18,973.57
  6. Step 6: Final answer
    x = 10,930.72

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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.