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Finding the Fourth Proportional to 3,990.65, 5,985.99 and 1,392.98

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Solution

The fourth proportional to 3,990.65, 5,985.99 and 1,392.98 is: 2,089.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,990.65 : 5,985.99 = 1,392.98 : x
  2. Step 2: Convert to fraction form
    3,990.65/5,985.99 = 1,392.98/x
  3. Step 3: Cross multiply
    3,990.65x = 5,985.99 × 1,392.98
  4. Step 4: Simplify right side
    3,990.65x = 8,338,364.35
  5. Step 5: Solve for x
    x = 8,338,364.35/3,990.65
  6. Step 6: Final answer
    x = 2,089.48

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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.