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Finding the Fourth Proportional to 8,679.81, 12,956.89 and 7,628.91

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Solution

The fourth proportional to 8,679.81, 12,956.89 and 7,628.91 is: 11,388.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,679.81 : 12,956.89 = 7,628.91 : x
  2. Step 2: Convert to fraction form
    8,679.81/12,956.89 = 7,628.91/x
  3. Step 3: Cross multiply
    8,679.81x = 12,956.89 × 7,628.91
  4. Step 4: Simplify right side
    8,679.81x = 98,846,909.32
  5. Step 5: Solve for x
    x = 98,846,909.32/8,679.81
  6. Step 6: Final answer
    x = 11,388.14

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.