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Finding the Fourth Proportional to 8,661.86, 11,955.17 and 5,672.15

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Solution

The fourth proportional to 8,661.86, 11,955.17 and 5,672.15 is: 7,828.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,661.86 : 11,955.17 = 5,672.15 : x
  2. Step 2: Convert to fraction form
    8,661.86/11,955.17 = 5,672.15/x
  3. Step 3: Cross multiply
    8,661.86x = 11,955.17 × 5,672.15
  4. Step 4: Simplify right side
    8,661.86x = 67,811,489.15
  5. Step 5: Solve for x
    x = 67,811,489.15/8,661.86
  6. Step 6: Final answer
    x = 7,828.74

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.