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Finding the Fourth Proportional to 620,626.80, 930,940.20 and 221,280.60

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Solution

The fourth proportional to 620,626.80, 930,940.20 and 221,280.60 is: 331,920.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    620,626.80 : 930,940.20 = 221,280.60 : x
  2. Step 2: Convert to fraction form
    620,626.80/930,940.20 = 221,280.60/x
  3. Step 3: Cross multiply
    620,626.80x = 930,940.20 × 221,280.60
  4. Step 4: Simplify right side
    620,626.80x = 205,999,006,020.12
  5. Step 5: Solve for x
    x = 205,999,006,020.12/620,626.80
  6. Step 6: Final answer
    x = 331,920.90

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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.