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Finding the Fourth Proportional to 2,179.90, 3,270.48 and 719.20

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Solution

The fourth proportional to 2,179.90, 3,270.48 and 719.20 is: 1,079.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,179.90 : 3,270.48 = 719.20 : x
  2. Step 2: Convert to fraction form
    2,179.90/3,270.48 = 719.20/x
  3. Step 3: Cross multiply
    2,179.90x = 3,270.48 × 719.20
  4. Step 4: Simplify right side
    2,179.90x = 2,352,129.22
  5. Step 5: Solve for x
    x = 2,352,129.22/2,179.90
  6. Step 6: Final answer
    x = 1,079.01

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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.