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Finding the Fourth Proportional to 12,689.70, 18,998.10 and 7,768.95

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Solution

The fourth proportional to 12,689.70, 18,998.10 and 7,768.95 is: 11,631.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,689.70 : 18,998.10 = 7,768.95 : x
  2. Step 2: Convert to fraction form
    12,689.70/18,998.10 = 7,768.95/x
  3. Step 3: Cross multiply
    12,689.70x = 18,998.10 × 7,768.95
  4. Step 4: Simplify right side
    12,689.70x = 147,595,289.00
  5. Step 5: Solve for x
    x = 147,595,289.00/12,689.70
  6. Step 6: Final answer
    x = 11,631.11

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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.