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Finding the Fourth Proportional to 5,717.79, 7,890.68 and 3,199.79

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Solution

The fourth proportional to 5,717.79, 7,890.68 and 3,199.79 is: 4,415.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,717.79 : 7,890.68 = 3,199.79 : x
  2. Step 2: Convert to fraction form
    5,717.79/7,890.68 = 3,199.79/x
  3. Step 3: Cross multiply
    5,717.79x = 7,890.68 × 3,199.79
  4. Step 4: Simplify right side
    5,717.79x = 25,248,546.68
  5. Step 5: Solve for x
    x = 25,248,546.68/5,717.79
  6. Step 6: Final answer
    x = 4,415.79

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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.