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Finding the Fourth Proportional to 129,808.53, 179,148.47 and 78,809.49

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Solution

The fourth proportional to 129,808.53, 179,148.47 and 78,809.49 is: 108,764.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,808.53 : 179,148.47 = 78,809.49 : x
  2. Step 2: Convert to fraction form
    129,808.53/179,148.47 = 78,809.49/x
  3. Step 3: Cross multiply
    129,808.53x = 179,148.47 × 78,809.49
  4. Step 4: Simplify right side
    129,808.53x = 14,118,599,160.93
  5. Step 5: Solve for x
    x = 14,118,599,160.93/129,808.53
  6. Step 6: Final answer
    x = 108,764.80

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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.