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Finding the Fourth Proportional to 8,721.94, 13,141.07 and 7,889.96

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Solution

The fourth proportional to 8,721.94, 13,141.07 and 7,889.96 is: 11,887.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,721.94 : 13,141.07 = 7,889.96 : x
  2. Step 2: Convert to fraction form
    8,721.94/13,141.07 = 7,889.96/x
  3. Step 3: Cross multiply
    8,721.94x = 13,141.07 × 7,889.96
  4. Step 4: Simplify right side
    8,721.94x = 103,682,510.06
  5. Step 5: Solve for x
    x = 103,682,510.06/8,721.94
  6. Step 6: Final answer
    x = 11,887.55

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.