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Finding the Fourth Proportional to 18,996.31, 28,497.71 and 8,470.15

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Solution

The fourth proportional to 18,996.31, 28,497.71 and 8,470.15 is: 12,706.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,996.31 : 28,497.71 = 8,470.15 : x
  2. Step 2: Convert to fraction form
    18,996.31/28,497.71 = 8,470.15/x
  3. Step 3: Cross multiply
    18,996.31x = 28,497.71 × 8,470.15
  4. Step 4: Simplify right side
    18,996.31x = 241,379,878.36
  5. Step 5: Solve for x
    x = 241,379,878.36/18,996.31
  6. Step 6: Final answer
    x = 12,706.67

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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.