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Finding the Fourth Proportional to 12,908.97, 17,813.75 and 7,318.89

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Solution

The fourth proportional to 12,908.97, 17,813.75 and 7,318.89 is: 10,099.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,908.97 : 17,813.75 = 7,318.89 : x
  2. Step 2: Convert to fraction form
    12,908.97/17,813.75 = 7,318.89/x
  3. Step 3: Cross multiply
    12,908.97x = 17,813.75 × 7,318.89
  4. Step 4: Simplify right side
    12,908.97x = 130,376,840.14
  5. Step 5: Solve for x
    x = 130,376,840.14/12,908.97
  6. Step 6: Final answer
    x = 10,099.71

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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.