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Finding the Fourth Proportional to 3,990.97, 5,985.40 and 1,217.34

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Solution

The fourth proportional to 3,990.97, 5,985.40 and 1,217.34 is: 1,825.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,990.97 : 5,985.40 = 1,217.34 : x
  2. Step 2: Convert to fraction form
    3,990.97/5,985.40 = 1,217.34/x
  3. Step 3: Cross multiply
    3,990.97x = 5,985.40 × 1,217.34
  4. Step 4: Simplify right side
    3,990.97x = 7,286,266.84
  5. Step 5: Solve for x
    x = 7,286,266.84/3,990.97
  6. Step 6: Final answer
    x = 1,825.69

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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.