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Finding the Fourth Proportional to 4,781.15, 7,163.63 and 2,928.40

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Solution

The fourth proportional to 4,781.15, 7,163.63 and 2,928.40 is: 4,387.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    4,781.15 : 7,163.63 = 2,928.40 : x
  2. Step 2: Convert to fraction form
    4,781.15/7,163.63 = 2,928.40/x
  3. Step 3: Cross multiply
    4,781.15x = 7,163.63 × 2,928.40
  4. Step 4: Simplify right side
    4,781.15x = 20,977,968.99
  5. Step 5: Solve for x
    x = 20,977,968.99/4,781.15
  6. Step 6: Final answer
    x = 4,387.64

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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.