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Finding the Fourth Proportional to 4,998.72, 7,500.48 and 1,920

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Solution

The fourth proportional to 4,998.72, 7,500.48 and 1,920 is: 2,880.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    4,998.72 : 7,500.48 = 1,920 : x
  2. Step 2: Convert to fraction form
    4,998.72/7,500.48 = 1,920/x
  3. Step 3: Cross multiply
    4,998.72x = 7,500.48 × 1,920
  4. Step 4: Simplify right side
    4,998.72x = 14,400,921.60
  5. Step 5: Solve for x
    x = 14,400,921.60/4,998.72
  6. Step 6: Final answer
    x = 2,880.92

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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.