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Finding the Fourth Proportional to 8,639.82, 11,928.69 and 6,646.86

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Solution

The fourth proportional to 8,639.82, 11,928.69 and 6,646.86 is: 9,177.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,639.82 : 11,928.69 = 6,646.86 : x
  2. Step 2: Convert to fraction form
    8,639.82/11,928.69 = 6,646.86/x
  3. Step 3: Cross multiply
    8,639.82x = 11,928.69 × 6,646.86
  4. Step 4: Simplify right side
    8,639.82x = 79,288,332.41
  5. Step 5: Solve for x
    x = 79,288,332.41/8,639.82
  6. Step 6: Final answer
    x = 9,177.08

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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.