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Finding the Fourth Proportional to 4,920.85, 7,387.72 and 2,923.21

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Solution

The fourth proportional to 4,920.85, 7,387.72 and 2,923.21 is: 4,388.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    4,920.85 : 7,387.72 = 2,923.21 : x
  2. Step 2: Convert to fraction form
    4,920.85/7,387.72 = 2,923.21/x
  3. Step 3: Cross multiply
    4,920.85x = 7,387.72 × 2,923.21
  4. Step 4: Simplify right side
    4,920.85x = 21,595,833.79
  5. Step 5: Solve for x
    x = 21,595,833.79/4,920.85
  6. Step 6: Final answer
    x = 4,388.64

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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.