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Finding the Fourth Proportional to 79,272.60, 109,314.52 and 55,390.56

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Solution

The fourth proportional to 79,272.60, 109,314.52 and 55,390.56 is: 76,381.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    79,272.60 : 109,314.52 = 55,390.56 : x
  2. Step 2: Convert to fraction form
    79,272.60/109,314.52 = 55,390.56/x
  3. Step 3: Cross multiply
    79,272.60x = 109,314.52 × 55,390.56
  4. Step 4: Simplify right side
    79,272.60x = 6,054,992,478.93
  5. Step 5: Solve for x
    x = 6,054,992,478.93/79,272.60
  6. Step 6: Final answer
    x = 76,381.91

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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.