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Finding the Fourth Proportional to 7,878.72, 11,817.36 and 2,406.72

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Solution

The fourth proportional to 7,878.72, 11,817.36 and 2,406.72 is: 3,609.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,878.72 : 11,817.36 = 2,406.72 : x
  2. Step 2: Convert to fraction form
    7,878.72/11,817.36 = 2,406.72/x
  3. Step 3: Cross multiply
    7,878.72x = 11,817.36 × 2,406.72
  4. Step 4: Simplify right side
    7,878.72x = 28,441,076.66
  5. Step 5: Solve for x
    x = 28,441,076.66/7,878.72
  6. Step 6: Final answer
    x = 3,609.86

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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.