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Finding the Fourth Proportional to 101,218.60, 151,730.70 and 78,716.80

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Solution

The fourth proportional to 101,218.60, 151,730.70 and 78,716.80 is: 117,999.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    101,218.60 : 151,730.70 = 78,716.80 : x
  2. Step 2: Convert to fraction form
    101,218.60/151,730.70 = 78,716.80/x
  3. Step 3: Cross multiply
    101,218.60x = 151,730.70 × 78,716.80
  4. Step 4: Simplify right side
    101,218.60x = 11,943,755,165.76
  5. Step 5: Solve for x
    x = 11,943,755,165.76/101,218.60
  6. Step 6: Final answer
    x = 117,999.61

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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.