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Finding the Fourth Proportional to 6,686.70, 10,020.45 and 4,917.90

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Solution

The fourth proportional to 6,686.70, 10,020.45 and 4,917.90 is: 7,369.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,686.70 : 10,020.45 = 4,917.90 : x
  2. Step 2: Convert to fraction form
    6,686.70/10,020.45 = 4,917.90/x
  3. Step 3: Cross multiply
    6,686.70x = 10,020.45 × 4,917.90
  4. Step 4: Simplify right side
    6,686.70x = 49,279,571.06
  5. Step 5: Solve for x
    x = 49,279,571.06/6,686.70
  6. Step 6: Final answer
    x = 7,369.79

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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.