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Finding the Fourth Proportional to 289,705.80, 434,558.70 and 261,712.20

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Solution

The fourth proportional to 289,705.80, 434,558.70 and 261,712.20 is: 392,568.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    289,705.80 : 434,558.70 = 261,712.20 : x
  2. Step 2: Convert to fraction form
    289,705.80/434,558.70 = 261,712.20/x
  3. Step 3: Cross multiply
    289,705.80x = 434,558.70 × 261,712.20
  4. Step 4: Simplify right side
    289,705.80x = 113,729,313,406.14
  5. Step 5: Solve for x
    x = 113,729,313,406.14/289,705.80
  6. Step 6: Final answer
    x = 392,568.30

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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.