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Finding the Fourth Proportional to 9,908.12, 13,660.62 and 7,078.88

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Solution

The fourth proportional to 9,908.12, 13,660.62 and 7,078.88 is: 9,759.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,908.12 : 13,660.62 = 7,078.88 : x
  2. Step 2: Convert to fraction form
    9,908.12/13,660.62 = 7,078.88/x
  3. Step 3: Cross multiply
    9,908.12x = 13,660.62 × 7,078.88
  4. Step 4: Simplify right side
    9,908.12x = 96,701,889.71
  5. Step 5: Solve for x
    x = 96,701,889.71/9,908.12
  6. Step 6: Final answer
    x = 9,759.86

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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.