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Finding the Fourth Proportional to 4,921.88, 7,379.64 and 2,421.32

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Solution

The fourth proportional to 4,921.88, 7,379.64 and 2,421.32 is: 3,630.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    4,921.88 : 7,379.64 = 2,421.32 : x
  2. Step 2: Convert to fraction form
    4,921.88/7,379.64 = 2,421.32/x
  3. Step 3: Cross multiply
    4,921.88x = 7,379.64 × 2,421.32
  4. Step 4: Simplify right side
    4,921.88x = 17,868,469.92
  5. Step 5: Solve for x
    x = 17,868,469.92/4,921.88
  6. Step 6: Final answer
    x = 3,630.42

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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.