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Finding the Fourth Proportional to 3,752.14, 5,628.21 and 978.80

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Solution

The fourth proportional to 3,752.14, 5,628.21 and 978.80 is: 1,468.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,752.14 : 5,628.21 = 978.80 : x
  2. Step 2: Convert to fraction form
    3,752.14/5,628.21 = 978.80/x
  3. Step 3: Cross multiply
    3,752.14x = 5,628.21 × 978.80
  4. Step 4: Simplify right side
    3,752.14x = 5,508,891.95
  5. Step 5: Solve for x
    x = 5,508,891.95/3,752.14
  6. Step 6: Final answer
    x = 1,468.20

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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.