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Finding the Fourth Proportional to 18,972.50, 28,459.96 and 7,880.09

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Solution

The fourth proportional to 18,972.50, 28,459.96 and 7,880.09 is: 11,820.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,972.50 : 28,459.96 = 7,880.09 : x
  2. Step 2: Convert to fraction form
    18,972.50/28,459.96 = 7,880.09/x
  3. Step 3: Cross multiply
    18,972.50x = 28,459.96 × 7,880.09
  4. Step 4: Simplify right side
    18,972.50x = 224,266,884.20
  5. Step 5: Solve for x
    x = 224,266,884.20/18,972.50
  6. Step 6: Final answer
    x = 11,820.63

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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.