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Finding the Fourth Proportional to 409,620.70, 614,431.05 and 129,166.30

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Solution

The fourth proportional to 409,620.70, 614,431.05 and 129,166.30 is: 193,749.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    409,620.70 : 614,431.05 = 129,166.30 : x
  2. Step 2: Convert to fraction form
    409,620.70/614,431.05 = 129,166.30/x
  3. Step 3: Cross multiply
    409,620.70x = 614,431.05 × 129,166.30
  4. Step 4: Simplify right side
    409,620.70x = 79,363,785,333.62
  5. Step 5: Solve for x
    x = 79,363,785,333.62/409,620.70
  6. Step 6: Final answer
    x = 193,749.45

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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.