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Finding the Fourth Proportional to 318,123.78, 439,019.22 and 172,939.33

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Solution

The fourth proportional to 318,123.78, 439,019.22 and 172,939.33 is: 238,660.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    318,123.78 : 439,019.22 = 172,939.33 : x
  2. Step 2: Convert to fraction form
    318,123.78/439,019.22 = 172,939.33/x
  3. Step 3: Cross multiply
    318,123.78x = 439,019.22 × 172,939.33
  4. Step 4: Simplify right side
    318,123.78x = 75,923,689,763.92
  5. Step 5: Solve for x
    x = 75,923,689,763.92/318,123.78
  6. Step 6: Final answer
    x = 238,660.84

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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.