Home / 231,213.78-319,074.09-129,239.21

Finding the Fourth Proportional to 231,213.78, 319,074.09 and 129,239.21

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Solution

The fourth proportional to 231,213.78, 319,074.09 and 129,239.21 is: 178,349.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    231,213.78 : 319,074.09 = 129,239.21 : x
  2. Step 2: Convert to fraction form
    231,213.78/319,074.09 = 129,239.21/x
  3. Step 3: Cross multiply
    231,213.78x = 319,074.09 × 129,239.21
  4. Step 4: Simplify right side
    231,213.78x = 41,236,881,727.70
  5. Step 5: Solve for x
    x = 41,236,881,727.70/231,213.78
  6. Step 6: Final answer
    x = 178,349.59

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1.5x scale

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.