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Finding the Fourth Proportional to 8,679.90, 11,975.04 and 5,697.40

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Solution

The fourth proportional to 8,679.90, 11,975.04 and 5,697.40 is: 7,860.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,679.90 : 11,975.04 = 5,697.40 : x
  2. Step 2: Convert to fraction form
    8,679.90/11,975.04 = 5,697.40/x
  3. Step 3: Cross multiply
    8,679.90x = 11,975.04 × 5,697.40
  4. Step 4: Simplify right side
    8,679.90x = 68,226,592.90
  5. Step 5: Solve for x
    x = 68,226,592.90/8,679.90
  6. Step 6: Final answer
    x = 7,860.30

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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.