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Finding the Fourth Proportional to 620,784.80, 931,177.20 and 221,438.60

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Solution

The fourth proportional to 620,784.80, 931,177.20 and 221,438.60 is: 332,157.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    620,784.80 : 931,177.20 = 221,438.60 : x
  2. Step 2: Convert to fraction form
    620,784.80/931,177.20 = 221,438.60/x
  3. Step 3: Cross multiply
    620,784.80x = 931,177.20 × 221,438.60
  4. Step 4: Simplify right side
    620,784.80x = 206,198,575,519.92
  5. Step 5: Solve for x
    x = 206,198,575,519.92/620,784.80
  6. Step 6: Final answer
    x = 332,157.90

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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.