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Finding the Fourth Proportional to 231,656.60, 319,662.78 and 129,675.44

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Solution

The fourth proportional to 231,656.60, 319,662.78 and 129,675.44 is: 178,939.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    231,656.60 : 319,662.78 = 129,675.44 : x
  2. Step 2: Convert to fraction form
    231,656.60/319,662.78 = 129,675.44/x
  3. Step 3: Cross multiply
    231,656.60x = 319,662.78 × 129,675.44
  4. Step 4: Simplify right side
    231,656.60x = 41,452,411,648.12
  5. Step 5: Solve for x
    x = 41,452,411,648.12/231,656.60
  6. Step 6: Final answer
    x = 178,939.05

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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.