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Finding the Fourth Proportional to 7,239.90, 9,990.90 and 4,096.02

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Solution

The fourth proportional to 7,239.90, 9,990.90 and 4,096.02 is: 5,652.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,239.90 : 9,990.90 = 4,096.02 : x
  2. Step 2: Convert to fraction form
    7,239.90/9,990.90 = 4,096.02/x
  3. Step 3: Cross multiply
    7,239.90x = 9,990.90 × 4,096.02
  4. Step 4: Simplify right side
    7,239.90x = 40,922,926.22
  5. Step 5: Solve for x
    x = 40,922,926.22/7,239.90
  6. Step 6: Final answer
    x = 5,652.42

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.