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Finding the Fourth Proportional to 3,980.61, 5,973.75 and 1,672.11

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Solution

The fourth proportional to 3,980.61, 5,973.75 and 1,672.11 is: 2,509.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,980.61 : 5,973.75 = 1,672.11 : x
  2. Step 2: Convert to fraction form
    3,980.61/5,973.75 = 1,672.11/x
  3. Step 3: Cross multiply
    3,980.61x = 5,973.75 × 1,672.11
  4. Step 4: Simplify right side
    3,980.61x = 9,988,767.11
  5. Step 5: Solve for x
    x = 9,988,767.11/3,980.61
  6. Step 6: Final answer
    x = 2,509.36

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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.