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Finding the Fourth Proportional to 9,900.12, 13,661.76 and 5,918.88

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Solution

The fourth proportional to 9,900.12, 13,661.76 and 5,918.88 is: 8,167.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,900.12 : 13,661.76 = 5,918.88 : x
  2. Step 2: Convert to fraction form
    9,900.12/13,661.76 = 5,918.88/x
  3. Step 3: Cross multiply
    9,900.12x = 13,661.76 × 5,918.88
  4. Step 4: Simplify right side
    9,900.12x = 80,862,318.03
  5. Step 5: Solve for x
    x = 80,862,318.03/9,900.12
  6. Step 6: Final answer
    x = 8,167.81

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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.