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Finding the Fourth Proportional to 620,820.60, 931,012.20 and 221,474.40

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Solution

The fourth proportional to 620,820.60, 931,012.20 and 221,474.40 is: 332,133.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    620,820.60 : 931,012.20 = 221,474.40 : x
  2. Step 2: Convert to fraction form
    620,820.60/931,012.20 = 221,474.40/x
  3. Step 3: Cross multiply
    620,820.60x = 931,012.20 × 221,474.40
  4. Step 4: Simplify right side
    620,820.60x = 206,195,368,387.68
  5. Step 5: Solve for x
    x = 206,195,368,387.68/620,820.60
  6. Step 6: Final answer
    x = 332,133.58

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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.