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Finding the Fourth Proportional to 12,979, 17,911.02 and 7,091

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Solution

The fourth proportional to 12,979, 17,911.02 and 7,091 is: 9,785.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,979 : 17,911.02 = 7,091 : x
  2. Step 2: Convert to fraction form
    12,979/17,911.02 = 7,091/x
  3. Step 3: Cross multiply
    12,979x = 17,911.02 × 7,091
  4. Step 4: Simplify right side
    12,979x = 127,007,042.82
  5. Step 5: Solve for x
    x = 127,007,042.82/12,979
  6. Step 6: Final answer
    x = 9,785.58

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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.