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Finding the Fourth Proportional to 8,687.72, 12,968.67 and 7,636.79

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Solution

The fourth proportional to 8,687.72, 12,968.67 and 7,636.79 is: 11,399.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,687.72 : 12,968.67 = 7,636.79 : x
  2. Step 2: Convert to fraction form
    8,687.72/12,968.67 = 7,636.79/x
  3. Step 3: Cross multiply
    8,687.72x = 12,968.67 × 7,636.79
  4. Step 4: Simplify right side
    8,687.72x = 99,038,944.53
  5. Step 5: Solve for x
    x = 99,038,944.53/8,687.72
  6. Step 6: Final answer
    x = 11,399.88

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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.