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Finding the Fourth Proportional to 391,521.32, 587,369.50 and 125,297.80

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Solution

The fourth proportional to 391,521.32, 587,369.50 and 125,297.80 is: 187,974.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,521.32 : 587,369.50 = 125,297.80 : x
  2. Step 2: Convert to fraction form
    391,521.32/587,369.50 = 125,297.80/x
  3. Step 3: Cross multiply
    391,521.32x = 587,369.50 × 125,297.80
  4. Step 4: Simplify right side
    391,521.32x = 73,596,106,137.10
  5. Step 5: Solve for x
    x = 73,596,106,137.10/391,521.32
  6. Step 6: Final answer
    x = 187,974.71

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.