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Finding the Fourth Proportional to 18,986.36, 28,489.74 and 7,900.70

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Solution

The fourth proportional to 18,986.36, 28,489.74 and 7,900.70 is: 11,855.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,986.36 : 28,489.74 = 7,900.70 : x
  2. Step 2: Convert to fraction form
    18,986.36/28,489.74 = 7,900.70/x
  3. Step 3: Cross multiply
    18,986.36x = 28,489.74 × 7,900.70
  4. Step 4: Simplify right side
    18,986.36x = 225,088,888.82
  5. Step 5: Solve for x
    x = 225,088,888.82/18,986.36
  6. Step 6: Final answer
    x = 11,855.29

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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.