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Finding the Fourth Proportional to 129,878.14, 179,230.13 and 72,518.44

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Solution

The fourth proportional to 129,878.14, 179,230.13 and 72,518.44 is: 100,074.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,878.14 : 179,230.13 = 72,518.44 : x
  2. Step 2: Convert to fraction form
    129,878.14/179,230.13 = 72,518.44/x
  3. Step 3: Cross multiply
    129,878.14x = 179,230.13 × 72,518.44
  4. Step 4: Simplify right side
    129,878.14x = 12,997,488,617.93
  5. Step 5: Solve for x
    x = 12,997,488,617.93/129,878.14
  6. Step 6: Final answer
    x = 100,074.49

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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.