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Finding the Fourth Proportional to 3,990.49, 5,986.51 and 1,357.89

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Solution

The fourth proportional to 3,990.49, 5,986.51 and 1,357.89 is: 2,037.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,990.49 : 5,986.51 = 1,357.89 : x
  2. Step 2: Convert to fraction form
    3,990.49/5,986.51 = 1,357.89/x
  3. Step 3: Cross multiply
    3,990.49x = 5,986.51 × 1,357.89
  4. Step 4: Simplify right side
    3,990.49x = 8,129,018.67
  5. Step 5: Solve for x
    x = 8,129,018.67/3,990.49
  6. Step 6: Final answer
    x = 2,037.10

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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.