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Finding the Fourth Proportional to 18,923.56, 28,395.06 and 8,400.79

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Solution

The fourth proportional to 18,923.56, 28,395.06 and 8,400.79 is: 12,605.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,923.56 : 28,395.06 = 8,400.79 : x
  2. Step 2: Convert to fraction form
    18,923.56/28,395.06 = 8,400.79/x
  3. Step 3: Cross multiply
    18,923.56x = 28,395.06 × 8,400.79
  4. Step 4: Simplify right side
    18,923.56x = 238,540,936.10
  5. Step 5: Solve for x
    x = 238,540,936.10/18,923.56
  6. Step 6: Final answer
    x = 12,605.50

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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.