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Finding the Fourth Proportional to 9,912.40, 13,679.07 and 5,375.20

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Solution

The fourth proportional to 9,912.40, 13,679.07 and 5,375.20 is: 7,417.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,912.40 : 13,679.07 = 5,375.20 : x
  2. Step 2: Convert to fraction form
    9,912.40/13,679.07 = 5,375.20/x
  3. Step 3: Cross multiply
    9,912.40x = 13,679.07 × 5,375.20
  4. Step 4: Simplify right side
    9,912.40x = 73,527,737.06
  5. Step 5: Solve for x
    x = 73,527,737.06/9,912.40
  6. Step 6: Final answer
    x = 7,417.75

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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.