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Finding the Fourth Proportional to 421,555.41, 632,205.50 and 221,765.61

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Solution

The fourth proportional to 421,555.41, 632,205.50 and 221,765.61 is: 332,581.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    421,555.41 : 632,205.50 = 221,765.61 : x
  2. Step 2: Convert to fraction form
    421,555.41/632,205.50 = 221,765.61/x
  3. Step 3: Cross multiply
    421,555.41x = 632,205.50 × 221,765.61
  4. Step 4: Simplify right side
    421,555.41x = 140,201,437,244.03
  5. Step 5: Solve for x
    x = 140,201,437,244.03/421,555.41
  6. Step 6: Final answer
    x = 332,581.28

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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.