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Finding the Fourth Proportional to 18,861.42, 28,272.42 and 10,529.22

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Solution

The fourth proportional to 18,861.42, 28,272.42 and 10,529.22 is: 15,782.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,861.42 : 28,272.42 = 10,529.22 : x
  2. Step 2: Convert to fraction form
    18,861.42/28,272.42 = 10,529.22/x
  3. Step 3: Cross multiply
    18,861.42x = 28,272.42 × 10,529.22
  4. Step 4: Simplify right side
    18,861.42x = 297,686,530.11
  5. Step 5: Solve for x
    x = 297,686,530.11/18,861.42
  6. Step 6: Final answer
    x = 15,782.83

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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.