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Finding the Fourth Proportional to 289,910.79, 434,907.18 and 90,251.33

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Solution

The fourth proportional to 289,910.79, 434,907.18 and 90,251.33 is: 135,389.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    289,910.79 : 434,907.18 = 90,251.33 : x
  2. Step 2: Convert to fraction form
    289,910.79/434,907.18 = 90,251.33/x
  3. Step 3: Cross multiply
    289,910.79x = 434,907.18 × 90,251.33
  4. Step 4: Simplify right side
    289,910.79x = 39,250,949,247.01
  5. Step 5: Solve for x
    x = 39,250,949,247.01/289,910.79
  6. Step 6: Final answer
    x = 135,389.75

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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.