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Finding the Fourth Proportional to 9,912.70, 13,678.50 and 5,664.82

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Solution

The fourth proportional to 9,912.70, 13,678.50 and 5,664.82 is: 7,816.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,912.70 : 13,678.50 = 5,664.82 : x
  2. Step 2: Convert to fraction form
    9,912.70/13,678.50 = 5,664.82/x
  3. Step 3: Cross multiply
    9,912.70x = 13,678.50 × 5,664.82
  4. Step 4: Simplify right side
    9,912.70x = 77,486,240.37
  5. Step 5: Solve for x
    x = 77,486,240.37/9,912.70
  6. Step 6: Final answer
    x = 7,816.87

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1.5x scale

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.