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Finding the Fourth Proportional to 18,987.65, 28,476.09 and 7,880.60

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Solution

The fourth proportional to 18,987.65, 28,476.09 and 7,880.60 is: 11,818.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,987.65 : 28,476.09 = 7,880.60 : x
  2. Step 2: Convert to fraction form
    18,987.65/28,476.09 = 7,880.60/x
  3. Step 3: Cross multiply
    18,987.65x = 28,476.09 × 7,880.60
  4. Step 4: Simplify right side
    18,987.65x = 224,408,674.85
  5. Step 5: Solve for x
    x = 224,408,674.85/18,987.65
  6. Step 6: Final answer
    x = 11,818.67

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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.