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Finding the Fourth Proportional to 18,900.39, 28,340.19 and 7,804.56

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Solution

The fourth proportional to 18,900.39, 28,340.19 and 7,804.56 is: 11,702.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,900.39 : 28,340.19 = 7,804.56 : x
  2. Step 2: Convert to fraction form
    18,900.39/28,340.19 = 7,804.56/x
  3. Step 3: Cross multiply
    18,900.39x = 28,340.19 × 7,804.56
  4. Step 4: Simplify right side
    18,900.39x = 221,182,713.27
  5. Step 5: Solve for x
    x = 221,182,713.27/18,900.39
  6. Step 6: Final answer
    x = 11,702.55

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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.