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Finding the Fourth Proportional to 85,940.97, 128,962.49 and 46,497.21

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Solution

The fourth proportional to 85,940.97, 128,962.49 and 46,497.21 is: 69,773.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,940.97 : 128,962.49 = 46,497.21 : x
  2. Step 2: Convert to fraction form
    85,940.97/128,962.49 = 46,497.21/x
  3. Step 3: Cross multiply
    85,940.97x = 128,962.49 × 46,497.21
  4. Step 4: Simplify right side
    85,940.97x = 5,996,395,979.65
  5. Step 5: Solve for x
    x = 5,996,395,979.65/85,940.97
  6. Step 6: Final answer
    x = 69,773.43

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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.