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Finding the Fourth Proportional to 18,885.46, 28,339.12 and 7,790.08

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Solution

The fourth proportional to 18,885.46, 28,339.12 and 7,790.08 is: 11,689.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,885.46 : 28,339.12 = 7,790.08 : x
  2. Step 2: Convert to fraction form
    18,885.46/28,339.12 = 7,790.08/x
  3. Step 3: Cross multiply
    18,885.46x = 28,339.12 × 7,790.08
  4. Step 4: Simplify right side
    18,885.46x = 220,764,011.93
  5. Step 5: Solve for x
    x = 220,764,011.93/18,885.46
  6. Step 6: Final answer
    x = 11,689.63

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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.