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Finding the Fourth Proportional to 5,719.76, 7,890.94 and 3,479.84

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Solution

The fourth proportional to 5,719.76, 7,890.94 and 3,479.84 is: 4,800.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,719.76 : 7,890.94 = 3,479.84 : x
  2. Step 2: Convert to fraction form
    5,719.76/7,890.94 = 3,479.84/x
  3. Step 3: Cross multiply
    5,719.76x = 7,890.94 × 3,479.84
  4. Step 4: Simplify right side
    5,719.76x = 27,459,208.65
  5. Step 5: Solve for x
    x = 27,459,208.65/5,719.76
  6. Step 6: Final answer
    x = 4,800.76

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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.