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Finding the Fourth Proportional to 8,643.41, 11,921.15 and 6,659.45

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Solution

The fourth proportional to 8,643.41, 11,921.15 and 6,659.45 is: 9,184.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,643.41 : 11,921.15 = 6,659.45 : x
  2. Step 2: Convert to fraction form
    8,643.41/11,921.15 = 6,659.45/x
  3. Step 3: Cross multiply
    8,643.41x = 11,921.15 × 6,659.45
  4. Step 4: Simplify right side
    8,643.41x = 79,388,269.07
  5. Step 5: Solve for x
    x = 79,388,269.07/8,643.41
  6. Step 6: Final answer
    x = 9,184.83

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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.