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Finding the Fourth Proportional to 68,310.25, 102,465.29 and 18,390.40

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Solution

The fourth proportional to 68,310.25, 102,465.29 and 18,390.40 is: 27,585.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,310.25 : 102,465.29 = 18,390.40 : x
  2. Step 2: Convert to fraction form
    68,310.25/102,465.29 = 18,390.40/x
  3. Step 3: Cross multiply
    68,310.25x = 102,465.29 × 18,390.40
  4. Step 4: Simplify right side
    68,310.25x = 1,884,377,833.43
  5. Step 5: Solve for x
    x = 1,884,377,833.43/68,310.25
  6. Step 6: Final answer
    x = 27,585.58

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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.