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Finding the Fourth Proportional to 521,107.40, 781,661.10 and 221,512.70

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Solution

The fourth proportional to 521,107.40, 781,661.10 and 221,512.70 is: 332,269.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    521,107.40 : 781,661.10 = 221,512.70 : x
  2. Step 2: Convert to fraction form
    521,107.40/781,661.10 = 221,512.70/x
  3. Step 3: Cross multiply
    521,107.40x = 781,661.10 × 221,512.70
  4. Step 4: Simplify right side
    521,107.40x = 173,147,860,745.97
  5. Step 5: Solve for x
    x = 173,147,860,745.97/521,107.40
  6. Step 6: Final answer
    x = 332,269.05

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Double scale
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Similar ratio
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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.