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Finding the Fourth Proportional to 390,939.75, 539,493.21 and 221,173.88

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Solution

The fourth proportional to 390,939.75, 539,493.21 and 221,173.88 is: 305,217.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,939.75 : 539,493.21 = 221,173.88 : x
  2. Step 2: Convert to fraction form
    390,939.75/539,493.21 = 221,173.88/x
  3. Step 3: Cross multiply
    390,939.75x = 539,493.21 × 221,173.88
  4. Step 4: Simplify right side
    390,939.75x = 119,321,803,791.89
  5. Step 5: Solve for x
    x = 119,321,803,791.89/390,939.75
  6. Step 6: Final answer
    x = 305,217.89

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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.