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Finding the Fourth Proportional to 289,709.80, 434,597.10 and 90,028.60

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Solution

The fourth proportional to 289,709.80, 434,597.10 and 90,028.60 is: 135,052.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    289,709.80 : 434,597.10 = 90,028.60 : x
  2. Step 2: Convert to fraction form
    289,709.80/434,597.10 = 90,028.60/x
  3. Step 3: Cross multiply
    289,709.80x = 434,597.10 × 90,028.60
  4. Step 4: Simplify right side
    289,709.80x = 39,126,168,477.06
  5. Step 5: Solve for x
    x = 39,126,168,477.06/289,709.80
  6. Step 6: Final answer
    x = 135,052.97

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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.