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Finding the Fourth Proportional to 18,743.70, 28,115.55 and 10,859.70

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Solution

The fourth proportional to 18,743.70, 28,115.55 and 10,859.70 is: 16,289.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,743.70 : 28,115.55 = 10,859.70 : x
  2. Step 2: Convert to fraction form
    18,743.70/28,115.55 = 10,859.70/x
  3. Step 3: Cross multiply
    18,743.70x = 28,115.55 × 10,859.70
  4. Step 4: Simplify right side
    18,743.70x = 305,326,438.34
  5. Step 5: Solve for x
    x = 305,326,438.34/18,743.70
  6. Step 6: Final answer
    x = 16,289.55

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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.