Home / 231,315.78-319,209.27-129,341.40

Finding the Fourth Proportional to 231,315.78, 319,209.27 and 129,341.40

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Solution

The fourth proportional to 231,315.78, 319,209.27 and 129,341.40 is: 178,487.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    231,315.78 : 319,209.27 = 129,341.40 : x
  2. Step 2: Convert to fraction form
    231,315.78/319,209.27 = 129,341.40/x
  3. Step 3: Cross multiply
    231,315.78x = 319,209.27 × 129,341.40
  4. Step 4: Simplify right side
    231,315.78x = 41,286,973,874.78
  5. Step 5: Solve for x
    x = 41,286,973,874.78/231,315.78
  6. Step 6: Final answer
    x = 178,487.49

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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.