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Finding the Fourth Proportional to 620,624.43, 931,009.55 and 221,321.97

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Solution

The fourth proportional to 620,624.43, 931,009.55 and 221,321.97 is: 332,008.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    620,624.43 : 931,009.55 = 221,321.97 : x
  2. Step 2: Convert to fraction form
    620,624.43/931,009.55 = 221,321.97/x
  3. Step 3: Cross multiply
    620,624.43x = 931,009.55 × 221,321.97
  4. Step 4: Simplify right side
    620,624.43x = 206,052,866,588.20
  5. Step 5: Solve for x
    x = 206,052,866,588.20/620,624.43
  6. Step 6: Final answer
    x = 332,008.95

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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.