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Finding the Fourth Proportional to 289,404.20, 434,048.70 and 139,644.20

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Solution

The fourth proportional to 289,404.20, 434,048.70 and 139,644.20 is: 209,438.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    289,404.20 : 434,048.70 = 139,644.20 : x
  2. Step 2: Convert to fraction form
    289,404.20/434,048.70 = 139,644.20/x
  3. Step 3: Cross multiply
    289,404.20x = 434,048.70 × 139,644.20
  4. Step 4: Simplify right side
    289,404.20x = 60,612,383,472.54
  5. Step 5: Solve for x
    x = 60,612,383,472.54/289,404.20
  6. Step 6: Final answer
    x = 209,438.51

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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.