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Finding the Fourth Proportional to 18,987.75, 28,491.90 and 7,902.09

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Solution

The fourth proportional to 18,987.75, 28,491.90 and 7,902.09 is: 11,857.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,987.75 : 28,491.90 = 7,902.09 : x
  2. Step 2: Convert to fraction form
    18,987.75/28,491.90 = 7,902.09/x
  3. Step 3: Cross multiply
    18,987.75x = 28,491.90 × 7,902.09
  4. Step 4: Simplify right side
    18,987.75x = 225,145,376.10
  5. Step 5: Solve for x
    x = 225,145,376.10/18,987.75
  6. Step 6: Final answer
    x = 11,857.40

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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.