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Finding the Fourth Proportional to 8,472.69, 12,720.24 and 6,807.87

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Solution

The fourth proportional to 8,472.69, 12,720.24 and 6,807.87 is: 10,220.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,472.69 : 12,720.24 = 6,807.87 : x
  2. Step 2: Convert to fraction form
    8,472.69/12,720.24 = 6,807.87/x
  3. Step 3: Cross multiply
    8,472.69x = 12,720.24 × 6,807.87
  4. Step 4: Simplify right side
    8,472.69x = 86,597,740.29
  5. Step 5: Solve for x
    x = 86,597,740.29/8,472.69
  6. Step 6: Final answer
    x = 10,220.81

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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.