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Finding the Fourth Proportional to 2,668.12, 4,001.62 and 720.34

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Solution

The fourth proportional to 2,668.12, 4,001.62 and 720.34 is: 1,080.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,668.12 : 4,001.62 = 720.34 : x
  2. Step 2: Convert to fraction form
    2,668.12/4,001.62 = 720.34/x
  3. Step 3: Cross multiply
    2,668.12x = 4,001.62 × 720.34
  4. Step 4: Simplify right side
    2,668.12x = 2,882,526.95
  5. Step 5: Solve for x
    x = 2,882,526.95/2,668.12
  6. Step 6: Final answer
    x = 1,080.36

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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.