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Finding the Fourth Proportional to 8,672.70, 13,009.05 and 6,339.90

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Solution

The fourth proportional to 8,672.70, 13,009.05 and 6,339.90 is: 9,509.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,672.70 : 13,009.05 = 6,339.90 : x
  2. Step 2: Convert to fraction form
    8,672.70/13,009.05 = 6,339.90/x
  3. Step 3: Cross multiply
    8,672.70x = 13,009.05 × 6,339.90
  4. Step 4: Simplify right side
    8,672.70x = 82,476,076.10
  5. Step 5: Solve for x
    x = 82,476,076.10/8,672.70
  6. Step 6: Final answer
    x = 9,509.85

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Similar ratio
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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.