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Finding the Fourth Proportional to 8,671.69, 12,999.72 and 3,121.13

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Solution

The fourth proportional to 8,671.69, 12,999.72 and 3,121.13 is: 4,678.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,671.69 : 12,999.72 = 3,121.13 : x
  2. Step 2: Convert to fraction form
    8,671.69/12,999.72 = 3,121.13/x
  3. Step 3: Cross multiply
    8,671.69x = 12,999.72 × 3,121.13
  4. Step 4: Simplify right side
    8,671.69x = 40,573,848.58
  5. Step 5: Solve for x
    x = 40,573,848.58/8,671.69
  6. Step 6: Final answer
    x = 4,678.89

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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.