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Finding the Fourth Proportional to 393,295.89, 542,764.54 and 221,221.88

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Solution

The fourth proportional to 393,295.89, 542,764.54 and 221,221.88 is: 305,295.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    393,295.89 : 542,764.54 = 221,221.88 : x
  2. Step 2: Convert to fraction form
    393,295.89/542,764.54 = 221,221.88/x
  3. Step 3: Cross multiply
    393,295.89x = 542,764.54 × 221,221.88
  4. Step 4: Simplify right side
    393,295.89x = 120,071,390,704.63
  5. Step 5: Solve for x
    x = 120,071,390,704.63/393,295.89
  6. Step 6: Final answer
    x = 305,295.31

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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.