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Finding the Fourth Proportional to 115,940.30, 172,871.91 and 113,840.78

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Solution

The fourth proportional to 115,940.30, 172,871.91 and 113,840.78 is: 169,741.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    115,940.30 : 172,871.91 = 113,840.78 : x
  2. Step 2: Convert to fraction form
    115,940.30/172,871.91 = 113,840.78/x
  3. Step 3: Cross multiply
    115,940.30x = 172,871.91 × 113,840.78
  4. Step 4: Simplify right side
    115,940.30x = 19,679,872,505.29
  5. Step 5: Solve for x
    x = 19,679,872,505.29/115,940.30
  6. Step 6: Final answer
    x = 169,741.43

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.