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Finding the Fourth Proportional to 18,605.70, 27,900.45 and 6,120.90

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Solution

The fourth proportional to 18,605.70, 27,900.45 and 6,120.90 is: 9,178.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,605.70 : 27,900.45 = 6,120.90 : x
  2. Step 2: Convert to fraction form
    18,605.70/27,900.45 = 6,120.90/x
  3. Step 3: Cross multiply
    18,605.70x = 27,900.45 × 6,120.90
  4. Step 4: Simplify right side
    18,605.70x = 170,775,864.41
  5. Step 5: Solve for x
    x = 170,775,864.41/18,605.70
  6. Step 6: Final answer
    x = 9,178.69

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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.