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Finding the Fourth Proportional to 18,709.94, 28,064.84 and 7,614.15

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Solution

The fourth proportional to 18,709.94, 28,064.84 and 7,614.15 is: 11,421.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,709.94 : 28,064.84 = 7,614.15 : x
  2. Step 2: Convert to fraction form
    18,709.94/28,064.84 = 7,614.15/x
  3. Step 3: Cross multiply
    18,709.94x = 28,064.84 × 7,614.15
  4. Step 4: Simplify right side
    18,709.94x = 213,689,863.42
  5. Step 5: Solve for x
    x = 213,689,863.42/18,709.94
  6. Step 6: Final answer
    x = 11,421.20

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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.