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Finding the Fourth Proportional to 6,669.65, 10,005.90 and 1,990.03

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Solution

The fourth proportional to 6,669.65, 10,005.90 and 1,990.03 is: 2,985.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,669.65 : 10,005.90 = 1,990.03 : x
  2. Step 2: Convert to fraction form
    6,669.65/10,005.90 = 1,990.03/x
  3. Step 3: Cross multiply
    6,669.65x = 10,005.90 × 1,990.03
  4. Step 4: Simplify right side
    6,669.65x = 19,912,016.11
  5. Step 5: Solve for x
    x = 19,912,016.11/6,669.65
  6. Step 6: Final answer
    x = 2,985.47

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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.