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Finding the Fourth Proportional to 8,679.79, 11,974.89 and 5,697.28

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Solution

The fourth proportional to 8,679.79, 11,974.89 and 5,697.28 is: 7,860.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,679.79 : 11,974.89 = 5,697.28 : x
  2. Step 2: Convert to fraction form
    8,679.79/11,974.89 = 5,697.28/x
  3. Step 3: Cross multiply
    8,679.79x = 11,974.89 × 5,697.28
  4. Step 4: Simplify right side
    8,679.79x = 68,224,301.30
  5. Step 5: Solve for x
    x = 68,224,301.30/8,679.79
  6. Step 6: Final answer
    x = 7,860.13

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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.