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Finding the Fourth Proportional to 290,620.83, 435,939.45 and 80,258.79

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Solution

The fourth proportional to 290,620.83, 435,939.45 and 80,258.79 is: 120,390.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    290,620.83 : 435,939.45 = 80,258.79 : x
  2. Step 2: Convert to fraction form
    290,620.83/435,939.45 = 80,258.79/x
  3. Step 3: Cross multiply
    290,620.83x = 435,939.45 × 80,258.79
  4. Step 4: Simplify right side
    290,620.83x = 34,987,972,770.27
  5. Step 5: Solve for x
    x = 34,987,972,770.27/290,620.83
  6. Step 6: Final answer
    x = 120,390.45

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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.