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Finding the Fourth Proportional to 4,978.20, 7,472.10 and 2,515.80

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Solution

The fourth proportional to 4,978.20, 7,472.10 and 2,515.80 is: 3,776.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    4,978.20 : 7,472.10 = 2,515.80 : x
  2. Step 2: Convert to fraction form
    4,978.20/7,472.10 = 2,515.80/x
  3. Step 3: Cross multiply
    4,978.20x = 7,472.10 × 2,515.80
  4. Step 4: Simplify right side
    4,978.20x = 18,798,309.18
  5. Step 5: Solve for x
    x = 18,798,309.18/4,978.20
  6. Step 6: Final answer
    x = 3,776.13

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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.