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Finding the Fourth Proportional to 7,728, 10,669.28 and 5,080

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Solution

The fourth proportional to 7,728, 10,669.28 and 5,080 is: 7,013.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,728 : 10,669.28 = 5,080 : x
  2. Step 2: Convert to fraction form
    7,728/10,669.28 = 5,080/x
  3. Step 3: Cross multiply
    7,728x = 10,669.28 × 5,080
  4. Step 4: Simplify right side
    7,728x = 54,199,942.40
  5. Step 5: Solve for x
    x = 54,199,942.40/7,728
  6. Step 6: Final answer
    x = 7,013.45

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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.