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Finding the Fourth Proportional to 12,607.05, 18,889.74 and 7,661.70

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Solution

The fourth proportional to 12,607.05, 18,889.74 and 7,661.70 is: 11,479.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,607.05 : 18,889.74 = 7,661.70 : x
  2. Step 2: Convert to fraction form
    12,607.05/18,889.74 = 7,661.70/x
  3. Step 3: Cross multiply
    12,607.05x = 18,889.74 × 7,661.70
  4. Step 4: Simplify right side
    12,607.05x = 144,727,520.96
  5. Step 5: Solve for x
    x = 144,727,520.96/12,607.05
  6. Step 6: Final answer
    x = 11,479.89

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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.