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Finding the Fourth Proportional to 3,984.66, 5,978.79 and 1,520.28

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Solution

The fourth proportional to 3,984.66, 5,978.79 and 1,520.28 is: 2,281.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,984.66 : 5,978.79 = 1,520.28 : x
  2. Step 2: Convert to fraction form
    3,984.66/5,978.79 = 1,520.28/x
  3. Step 3: Cross multiply
    3,984.66x = 5,978.79 × 1,520.28
  4. Step 4: Simplify right side
    3,984.66x = 9,089,434.86
  5. Step 5: Solve for x
    x = 9,089,434.86/3,984.66
  6. Step 6: Final answer
    x = 2,281.11

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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.