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Finding the Fourth Proportional to 78,819.06, 108,888.81 and 51,659.61

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Solution

The fourth proportional to 78,819.06, 108,888.81 and 51,659.61 is: 71,367.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,819.06 : 108,888.81 = 51,659.61 : x
  2. Step 2: Convert to fraction form
    78,819.06/108,888.81 = 51,659.61/x
  3. Step 3: Cross multiply
    78,819.06x = 108,888.81 × 51,659.61
  4. Step 4: Simplify right side
    78,819.06x = 5,625,153,457.96
  5. Step 5: Solve for x
    x = 5,625,153,457.96/78,819.06
  6. Step 6: Final answer
    x = 71,367.93

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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.