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Finding the Fourth Proportional to 3,489.71, 5,235.58 and 1,408.65

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Solution

The fourth proportional to 3,489.71, 5,235.58 and 1,408.65 is: 2,113.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,489.71 : 5,235.58 = 1,408.65 : x
  2. Step 2: Convert to fraction form
    3,489.71/5,235.58 = 1,408.65/x
  3. Step 3: Cross multiply
    3,489.71x = 5,235.58 × 1,408.65
  4. Step 4: Simplify right side
    3,489.71x = 7,375,066.55
  5. Step 5: Solve for x
    x = 7,375,066.55/3,489.71
  6. Step 6: Final answer
    x = 2,113.38

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.