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Finding the Fourth Proportional to 12,991.88, 19,488.83 and 4,672.97

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Solution

The fourth proportional to 12,991.88, 19,488.83 and 4,672.97 is: 7,009.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,991.88 : 19,488.83 = 4,672.97 : x
  2. Step 2: Convert to fraction form
    12,991.88/19,488.83 = 4,672.97/x
  3. Step 3: Cross multiply
    12,991.88x = 19,488.83 × 4,672.97
  4. Step 4: Simplify right side
    12,991.88x = 91,070,743.28
  5. Step 5: Solve for x
    x = 91,070,743.28/12,991.88
  6. Step 6: Final answer
    x = 7,009.82

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.