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Finding the Fourth Proportional to 8,678.70, 12,999.83 and 7,220.70

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Solution

The fourth proportional to 8,678.70, 12,999.83 and 7,220.70 is: 10,815.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,678.70 : 12,999.83 = 7,220.70 : x
  2. Step 2: Convert to fraction form
    8,678.70/12,999.83 = 7,220.70/x
  3. Step 3: Cross multiply
    8,678.70x = 12,999.83 × 7,220.70
  4. Step 4: Simplify right side
    8,678.70x = 93,867,836.38
  5. Step 5: Solve for x
    x = 93,867,836.38/8,678.70
  6. Step 6: Final answer
    x = 10,815.89

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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.