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Finding the Fourth Proportional to 18,748.65, 28,123.48 and 8,213.25

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Solution

The fourth proportional to 18,748.65, 28,123.48 and 8,213.25 is: 12,320.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,748.65 : 28,123.48 = 8,213.25 : x
  2. Step 2: Convert to fraction form
    18,748.65/28,123.48 = 8,213.25/x
  3. Step 3: Cross multiply
    18,748.65x = 28,123.48 × 8,213.25
  4. Step 4: Simplify right side
    18,748.65x = 230,985,172.11
  5. Step 5: Solve for x
    x = 230,985,172.11/18,748.65
  6. Step 6: Final answer
    x = 12,320.10

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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.