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Finding the Fourth Proportional to 339,869.20, 509,220.60 and 221,479.60

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Solution

The fourth proportional to 339,869.20, 509,220.60 and 221,479.60 is: 331,839.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    339,869.20 : 509,220.60 = 221,479.60 : x
  2. Step 2: Convert to fraction form
    339,869.20/509,220.60 = 221,479.60/x
  3. Step 3: Cross multiply
    339,869.20x = 509,220.60 × 221,479.60
  4. Step 4: Simplify right side
    339,869.20x = 112,781,974,799.76
  5. Step 5: Solve for x
    x = 112,781,974,799.76/339,869.20
  6. Step 6: Final answer
    x = 331,839.35

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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.