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Finding the Fourth Proportional to 620,628.40, 930,942.60 and 221,282.20

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Solution

The fourth proportional to 620,628.40, 930,942.60 and 221,282.20 is: 331,923.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    620,628.40 : 930,942.60 = 221,282.20 : x
  2. Step 2: Convert to fraction form
    620,628.40/930,942.60 = 221,282.20/x
  3. Step 3: Cross multiply
    620,628.40x = 930,942.60 × 221,282.20
  4. Step 4: Simplify right side
    620,628.40x = 206,001,026,601.72
  5. Step 5: Solve for x
    x = 206,001,026,601.72/620,628.40
  6. Step 6: Final answer
    x = 331,923.30

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1.5x scale

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.