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Finding the Fourth Proportional to 68,310, 102,480.12 and 28,900.80

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Solution

The fourth proportional to 68,310, 102,480.12 and 28,900.80 is: 43,357.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,310 : 102,480.12 = 28,900.80 : x
  2. Step 2: Convert to fraction form
    68,310/102,480.12 = 28,900.80/x
  3. Step 3: Cross multiply
    68,310x = 102,480.12 × 28,900.80
  4. Step 4: Simplify right side
    68,310x = 2,961,757,452.10
  5. Step 5: Solve for x
    x = 2,961,757,452.10/68,310
  6. Step 6: Final answer
    x = 43,357.60

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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.