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Finding the Fourth Proportional to 8,666.76, 13,002.66 and 3,120

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Solution

The fourth proportional to 8,666.76, 13,002.66 and 3,120 is: 4,680.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,666.76 : 13,002.66 = 3,120 : x
  2. Step 2: Convert to fraction form
    8,666.76/13,002.66 = 3,120/x
  3. Step 3: Cross multiply
    8,666.76x = 13,002.66 × 3,120
  4. Step 4: Simplify right side
    8,666.76x = 40,568,299.20
  5. Step 5: Solve for x
    x = 40,568,299.20/8,666.76
  6. Step 6: Final answer
    x = 4,680.91

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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.