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Finding the Fourth Proportional to 1,986.21, 2,978.21 and 753.27

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Solution

The fourth proportional to 1,986.21, 2,978.21 and 753.27 is: 1,129.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,986.21 : 2,978.21 = 753.27 : x
  2. Step 2: Convert to fraction form
    1,986.21/2,978.21 = 753.27/x
  3. Step 3: Cross multiply
    1,986.21x = 2,978.21 × 753.27
  4. Step 4: Simplify right side
    1,986.21x = 2,243,392.48
  5. Step 5: Solve for x
    x = 2,243,392.48/1,986.21
  6. Step 6: Final answer
    x = 1,129.48

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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.