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Finding the Fourth Proportional to 6,515.70, 8,990.73 and 3,721.02

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Solution

The fourth proportional to 6,515.70, 8,990.73 and 3,721.02 is: 5,134.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,515.70 : 8,990.73 = 3,721.02 : x
  2. Step 2: Convert to fraction form
    6,515.70/8,990.73 = 3,721.02/x
  3. Step 3: Cross multiply
    6,515.70x = 8,990.73 × 3,721.02
  4. Step 4: Simplify right side
    6,515.70x = 33,454,686.14
  5. Step 5: Solve for x
    x = 33,454,686.14/6,515.70
  6. Step 6: Final answer
    x = 5,134.47

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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.