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Finding the Fourth Proportional to 5,717.88, 7,890.12 and 3,199.86

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Solution

The fourth proportional to 5,717.88, 7,890.12 and 3,199.86 is: 4,415.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,717.88 : 7,890.12 = 3,199.86 : x
  2. Step 2: Convert to fraction form
    5,717.88/7,890.12 = 3,199.86/x
  3. Step 3: Cross multiply
    5,717.88x = 7,890.12 × 3,199.86
  4. Step 4: Simplify right side
    5,717.88x = 25,247,279.38
  5. Step 5: Solve for x
    x = 25,247,279.38/5,717.88
  6. Step 6: Final answer
    x = 4,415.50

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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.