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Finding the Fourth Proportional to 81,323.51, 121,961.84 and 28,013.33

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Solution

The fourth proportional to 81,323.51, 121,961.84 and 28,013.33 is: 42,011.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,323.51 : 121,961.84 = 28,013.33 : x
  2. Step 2: Convert to fraction form
    81,323.51/121,961.84 = 28,013.33/x
  3. Step 3: Cross multiply
    81,323.51x = 121,961.84 × 28,013.33
  4. Step 4: Simplify right side
    81,323.51x = 3,416,556,521.45
  5. Step 5: Solve for x
    x = 3,416,556,521.45/81,323.51
  6. Step 6: Final answer
    x = 42,011.92

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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.