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Finding the Fourth Proportional to 4,791.72, 7,188 and 1,281.64

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Solution

The fourth proportional to 4,791.72, 7,188 and 1,281.64 is: 1,922.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    4,791.72 : 7,188 = 1,281.64 : x
  2. Step 2: Convert to fraction form
    4,791.72/7,188 = 1,281.64/x
  3. Step 3: Cross multiply
    4,791.72x = 7,188 × 1,281.64
  4. Step 4: Simplify right side
    4,791.72x = 9,212,428.32
  5. Step 5: Solve for x
    x = 9,212,428.32/4,791.72
  6. Step 6: Final answer
    x = 1,922.57

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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.