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Finding the Fourth Proportional to 68,790, 94,930.20 and 40,513.08

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Solution

The fourth proportional to 68,790, 94,930.20 and 40,513.08 is: 55,908.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,790 : 94,930.20 = 40,513.08 : x
  2. Step 2: Convert to fraction form
    68,790/94,930.20 = 40,513.08/x
  3. Step 3: Cross multiply
    68,790x = 94,930.20 × 40,513.08
  4. Step 4: Simplify right side
    68,790x = 3,845,914,787.02
  5. Step 5: Solve for x
    x = 3,845,914,787.02/68,790
  6. Step 6: Final answer
    x = 55,908.05

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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.