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Finding the Fourth Proportional to 72,679.84, 108,998.70 and 28,296.70

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Solution

The fourth proportional to 72,679.84, 108,998.70 and 28,296.70 is: 42,436.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,679.84 : 108,998.70 = 28,296.70 : x
  2. Step 2: Convert to fraction form
    72,679.84/108,998.70 = 28,296.70/x
  3. Step 3: Cross multiply
    72,679.84x = 108,998.70 × 28,296.70
  4. Step 4: Simplify right side
    72,679.84x = 3,084,303,514.29
  5. Step 5: Solve for x
    x = 3,084,303,514.29/72,679.84
  6. Step 6: Final answer
    x = 42,436.85

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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.