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Finding the Fourth Proportional to 391,226.42, 539,899.31 and 219,142.89

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Solution

The fourth proportional to 391,226.42, 539,899.31 and 219,142.89 is: 302,421.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,226.42 : 539,899.31 = 219,142.89 : x
  2. Step 2: Convert to fraction form
    391,226.42/539,899.31 = 219,142.89/x
  3. Step 3: Cross multiply
    391,226.42x = 539,899.31 × 219,142.89
  4. Step 4: Simplify right side
    391,226.42x = 118,315,094,006.69
  5. Step 5: Solve for x
    x = 118,315,094,006.69/391,226.42
  6. Step 6: Final answer
    x = 302,421.03

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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.